Dr. John Feldmeier
Professor
Physics, Astronomy, Geology, & Environmental Sciences
Ward Beecher Hall 2021
phone: (330) 941-1381
Bio
I am an observational astronomer. I observe celestial objects with telescopes in order to answer fundamental questions of how planets, stars, and galaxies are formed and change over time. As a professor at Youngstown State University (YSU), I teach astronomy to non-science majors in order to bring them the excitement of modern science. I train students who are considering professional careers in astronomy. I also perform service to the university, to the professional field of astronomy, and to the general public as a whole.
Research Interests
My scholarly activities include observational studies of galaxies, galaxy clusters, galaxy groups, extragalactic planetary nebulae, high redshift galaxies, stars that vary in brightness, and extra-solar planets.
As is customary in astronomy, my research is done in collaboration with other astronomers. In my case, these include astronomers at Penn State, Case Western Reserve, Rutgers, Yale, Vanderbilt, Lowell Observatory, and the National Optical Astronomical Observatories (NOAO; a federally-funded astronomical observatory). I also collaborate with scientists in other countries, including Italy, Germany, and Chile and I also collaborate closely with my colleague at YSU, Dr. Patrick Durrell.
Teaching Interests
I am interested in active learning techniques in STEM classes, using learner-centered education. New techniques such as inquiry-based education and collaborative learning methods have been shown to improve student learning substantially in experiments involving thousands of students These techniques do not mean small classes or an excessive amount of preparation time; they mean adapting teaching styles to create the best environment for student learning.
I have been interested in applying these techniques to the classroom, focusing on ongoing improvement and documentation of effectiveness. Whenever possible, I have collaborated with the experts in astronomy and physics education research to improve my classes and to share what I have learned in applying these new methods.
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Education
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2000
Ph D, Astronomy and Astrophysics
Pennsylvania State University
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1994
BS, Physics
University of Texas, Austin
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1994
BA, Astronomy
University of Texas, Austin
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Awards and Honors
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March 2019
Youngstown State University
Distinguished Professor in Service,
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March 2019
Youngstown State University
Distinguished Professor Designation
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March 2016
Youngstown State University
Distinguished Professor in Teaching
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March 2011
Youngstown State University
Distinguished Professor in Scholarship
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November 1996
Sigma Xi research society
Nominated
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June 1992
National Science Foundation
Research Experience for Undergraduates - Center for Particle Astrophysics
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August 1989
United States Automobile Association
National Merit Scholar
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August 1989
University of Texas, Austin
Dean’s Scholars of Natural Sciences
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Past History
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2018
Youngstown State University
Full Professor
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2012
Youngstown State University
Associate Professor
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2006
Youngstown State University
Assistant Professor
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2003
National Science Foundation
Astronomy and Astrophysics Postdoctoral Fellow
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2000
Case Western Reserve University
Research Associate
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1996
Pennsylvania State University
Research Assistant
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1994
Pennsylvania State University
Teaching Assistant
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1993
University of Texas
Unix Systems Administrator
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Intellectual Contributions
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2024
"BST1047+1156: A (Failing) Ultradiffuse Tidal Dwarf in the Leo I Group"
The Astrophysical Journal
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2023
"The HETDEX Survey Emission-line Exploration and Source Classification"
The Astrophysical Journal, volume 946, issue 2, p. 86
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2023
"HETDEX Public Source Catalog 1: 220 K Sources Including Over 50 K Ly-alpha Emitters from an Untargeted Wide-area Spectroscopic Survey"
The Astrophysical Journal, volume 943, issue 2, p. 177
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2021
"The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections"
\apj, volume 923, issue 2, p. 217
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2021
"Probing the Origins of BST1047+1156, the Most Diffuse Star Forming Galaxy"
, p. 16762 -
2019
"The Spitzer-HETDEX Exploratory Large Area Survey. II. The Dark Energy Camera and Spitzer/IRAC Multiwavelength Catalog"
\apjs, volume 240, issue 1, p. 5
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2018
"The True Luminosities of Planetary Nebulae in M31's Bulge: Massive Central Stars from an Old Stellar Population"
\apj, volume 863, issue 2, p. 189
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2018
"Stellar Populations in the Outer Disk and Halo of the Spiral Galaxy M101"
The Astrophysical Journal, volume 862, issue 2, p. 99
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2018
"The Planetary Nebula Luminosity Function (PNLF): Contamination from Supernova Remnants"
Research Notes of the American Astronomical Society, volume 2, issue 1, p. 32
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2018
"A Renewed Look at the Planetary Nebula Luminosity Function: Circumstellar Extinction and Contamination From Compact Supernova Remnants"
, volume 231, p. 241.10 -
2017
"Bayesian Redshift Classification of Emission-line Galaxies with Photometric Equivalent Widths"
\apj, volume 843, issue 2, p. 130
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2017
"Erratum: Searching for Diffuse Light in the M96 Galaxy Group"
The Astrophysical Journal, volume 836, issue 1, p. 145
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2017
"The Burrell Schmidt Deep Virgo Survey: Tidal Debris, Galaxy Halos, and Diffuse Intracluster Light in the Virgo Cluster"
\apj, volume 834, issue 1, p. 16
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2017
"Stellar Populations in the Outer Regions of M101"
, volume 229, p. 144.20 -
2015
"Galaxies at the Extremes: Ultra-diffuse Galaxies in the Virgo Cluster"
The Astrophysical Journal Letters, volume 809, issue 2, p. L21
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2014
"Searching for Diffuse Light in the M96 Galaxy Group"
\apj, volume 791, issue 1, p. 38
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2014
"3D-HST Emission Line Galaxies at z \raisebox-0.5ex\textasciitilde 2: Discrepancies in the Optical/UV Star Formation Rates"
\apj, volume 790, issue 2, p. 113
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2014
"To Stack or Not to Stack: Spectral Energy Distribution Properties of Ly\ensuremath\alpha-emitting Galaxies at z = 2.1"
\apj, volume 783, issue 1, p. 26
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2014
"Further Studies of Lyman-alpha Galaxy Halos in MUSYC-LAE Fields"
, volume 223, p. 246.43 -
2014
"Cosmic Variance in the Physical Properties of Ly-alpha Emitting Galaxies at 2
, volume 223, p. 246.39 -
2014
"Constraints on Ly\ensuremath\alpha Blob Number Densities at 2.1 and 3.1"
, volume 223, p. 246.40 -
2013
"Searching for Neutral Hydrogen Halos around z ~ 2.1 and z ~3.1 Ly-alpha Emitting Galaxies"
The Astrophysical Journal, volume 776, issue 2, p. 75
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2013
"Stellar Populations in the Outer Halo of the Massive Elliptical M49"
The Astrophysical Journal, Letters, volume 764, issue 2, p. L20
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2013
"The Extended Optical Disk of M101"
\apj, volume 762, issue 2, p. 82
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2012
"Identifying High-metallicity M Giants at Intragroup Distances with Sloan Digital Sky Survey"
The Astronomical Journal, volume 143, issue 6, p. 128
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2012
"Cosmic Variance in the Physical Properties of Ly-alpha Emitting Galaxies at 2 < z < 3"
, volume 220, p. 429.06 -
2012
"A Search for Diffuse Ly-alpha Emitting Halos around z 2.1 and z 3.1 Ly-alpha Emitting Galaxies"
, volume 220, p. 429.05 -
2012
"An Imaging Survey for the Hobby-Eberly Telescope Dark Energy Experiment"
, p. 282 -
2012
"The Evolution of Ly\ensuremath\alpha-emitting Galaxies between z = 2.1 and z = 3.1"
\apj, volume 744, issue 2, p. 110
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2012
"A Search For Lyman-alpha Halos Around Lyman-alpha Emitters At Z=2 And Z=3"
, volume 219, p. 441.14 -
2011
"The Rest-frame Ultraviolet Light Profile Shapes of Ly\ensuremath\alpha-emitting Galaxies at z = 3.1"
\apj, volume 743, issue 1, p. 9
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2011
"The Burrell-Optical-Kepler-Survey (BOKS). I. Survey Description and Initial Results"
\aj, volume 142, issue 1, p. 2
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2011
"The Distance to the Antennae Galaxy"
, p. 466 -
2011
"Searching for Intragroup Light in Multiple Galaxy Groups"
, volume 217, p. 149.25 -
2010
"Kepler Observations of Three Pre-launch Exoplanet Candidates: Discovery of Two Eclipsing Binaries and a New Exoplanet"
\apj, volume 725, issue 2, p. 1633-1643
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2010
"Optical Colors of Intracluster Light in the Virgo Cluster Core"
\apj, volume 720, issue 1, p. 569-580
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2010
"Evidence for Spatially Compact Ly-alpha Emission in z = 3.1 Ly-alpha-emitting Galaxies"
Astrophysical Journal, Letters, volume 716, issue 2, p. L200-L204
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2010
"Diffuse Tidal Structures in the Halos of Virgo Ellipticals"
\apj, volume 715, issue 2, p. 972-985
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2010
"Ly\ensuremath\alpha-emitting Galaxies at z = 2.1 in ECDF-S: Building Blocks of Typical Present-day Galaxies?"
\apj, volume 714, issue 1, p. 255-269
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2010
"The Kinematics of Virgo's Intracluster Stars"
, p. 465 -
2010
"Ly(alpha) Emitting Galaxies at z=2.1: Characterizing the Progenitors of Typical Present-day Galaxies"
, p. 460 -
2010
"The Shapes of Lyman-alpha Emitting Galaxies at z=3.1"
, volume 215, p. 410.09 -
2010
"The CAE/CATS Guest Moderator Program: Fostering Better Astronomy Education Through Professional Discussions"
, volume 215, p. 447.10 -
2010
"Searching For Intragroup Light in Normal and Compact Galaxy Groups"
, volume 215, p. 436.33 -
2010
"Searching for Intracluster Globular Clusters in the Virgo Cluster"
, volume 215, p. 478.14 -
2010
"Lyman Alpha-emitting Galaxies at z = 2.1: Characterizing the Progenitors of Typical Present-day Galaxies"
, volume 215, p. 307.03 -
2010
"Luminosity Functions and Photometric Properties of Lyman-alpha Emitters at 2 < z < 3"
, volume 215, p. 410.10 -
2010
"Kepler Observations of Three Pre-Launch Exo-Planet Candidates"
, volume 215, p. 420.01 -
2010
"Diffuse Stellar Substructure in Virgo Ellipticals"
, volume 215, p. 458.11 -
2010
"A Search For Planetary Nebulae in the Globular Cluster Population of M31"
, volume 215, p. 454.27 -
2009
"The edge of the M 87 halo and the kinematics of the diffuse light in the Virgo cluster core"
\aap, volume 502, issue 3, p. 771-786
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2009
"\%Tracing the Clustering and Luminosity Function of Ly(alpha) Emitting Galaxies from z=3.1 to z=2.1 Finding Our Birth Parents: Searching for Milky Way Progenitors at z=2.1"
, p. 514 -
2009
"The Connection Between Diffuse Light and Intracluster Planetary Nebulae in the Virgo Cluster"
\apj, volume 698, issue 2, p. 1879-1892
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2009
"Searching for Planetary Nebulae in Ursa Major: Studies of the Tully- Fisher relation and Intracluster Light"
, p. 210 -
2009
"Probing the Dark Matter-Galaxy Formation Connection with Lyman Alpha Emitting Galaxies"
, volume 213, p. 313.02 -
2009
"Luminosity Functions and Photometric Properties of Lyman-alpha Emitters at z 3"
, volume 213, p. 424.09 -
2009
"A Catalog of [O III] 5007 Photometric Standards In The Virgo Cluster Region"
, volume 213, p. 473.06 -
2008
"A Spectacular H\ensuremath\alpha Complex in Virgo: Evidence for a Collision between M86 and NGC 4438 and Implications for the Collisional ISM Heating of Ellipticals"
\apjl, volume 687, issue 2, p. L69
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2008
"The Stellar Kinematics of Polar Ring Galaxies"
, p. 345 -
2008
"Planetary Nebulae in Face-On Spiral Galaxies. I. Planetary Nebula Photometry and Distances"
\apj, volume 683, issue 2, p. 630-643
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2008
"A Search for Planetary Nebulae in M31 Globular Clusters"
, p. 317 -
2008
"Expansion Velocities and Core Masses of Bright Planetary Nebulae in the Virgo Cluster"
\apjl, volume 674, issue 1, p. L17
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2007
"Measuring the Production Rate of Planetary Nebulae in Spiral Galaxies"
, volume 211, p. 95.22 -
2007
"Ly\ensuremath\alpha-Emitting Galaxies at z = 3.1: L* Progenitors Experiencing Rapid Star Formation"
\apj, volume 671, issue 1, p. 278-284
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2007
"Burrell-Optical-Kepler Survey (BOKS): Exo-planet Search In Cygnus"
, volume 211, p. 134.12 -
2007
"A Collisional Debris Trail Around the Virgo Elliptical M86"
, volume 211, p. 122.05 -
2007
"Ly\ensuremath\alpha Emission-Line Galaxies at z = 3.1 in the Extended Chandra Deep Field-South"
\apj, volume 667, issue 1, p. 79-91
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2007
"Exploring the Chemical History of Early Stellar Populations"
, p. 124 -
2007
"The Physical Nature of Lyman Alpha Emitters at z=3.1"
, volume 210, p. 97.04 -
2007
"Calibrating Type Ia Supernovae Using the Planetary Nebula Luminosity Function. I. Initial Results"
\apj, volume 657, issue 1, p. 76-94
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2007
"The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster"
The Astrophysical Journal, volume 656, issue 2, p. 746-755
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2007
"The Metallicity Distribution of Intracluster Stars in Virgo"
The Astrophysical Journal, volume 656, issue 2, p. 756-769
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2007
"Virgo's Intracluster Globular Clusters as Seen by the Advanced Camera for Surveys"
The Astrophysical Journal, volume 654, issue 2, p. 835-843
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2006
"The Nature of Lyman Alpha Emitters at z=3.1 in the MUSYC Survey"
, volume 209, p. 225.07 -
2006
"The Luminosity Function of Ly\ensuremath\alpha Emitters at z=3.1"
, volume 209, p. 171.05 -
2006
"Spitzer Space Telescope Research Program for Teachers and Students: Using Spitzer data in your classroom with (relatively) simple software"
, volume 209, p. 218.15 -
2006
"PNLF Distances to Six Face-On Spiral Galaxies"
, volume 209, p. 04.16 -
2006
"Multiwavelength Observations of Tidally Induced Star Formation in the M81 Group"
, volume 209, p. 15.06 -
2006
"Burrell-Optical-Kepler Survey (BOKS) II: Early Variability Results"
, volume 209, p. 162.16 -
2006
"Burrell-Optical-Kepler Survey (BOKS) I: Survey Description"
, volume 209, p. 162.15 -
2006
"IMACS Spectroscopy of the E-CDFS: A Census of Protogalaxies at z=3.1"
, p. 412 -
2006
"Calibrating the Hubble Constant Using Planetary Nebula Luminosity Function. Distances to Type 1A Supernovae"
, volume 26, p. 196 -
2006
"The Physical Nature of Ly\ensuremath\alpha-emitting Galaxies at z=3.1"
\apjl, volume 642, issue 1, p. L13-L16
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2006
"The Planetary Nebula System of M94"
, p. 147 -
2006
"Intracluster Planetary Nebulae as Probes of Intracluster Starlight"
, p. 331 -
2006
"Intracluster Planetary Nebulae"
, volume 234, p. 33-40 -
2006
"Calibrating Type Ia SNe Using the Planetary Nebula Luminosity Function"
, volume 234, p. 435-436 -
2005
"VICS: The Virgo Intra-Cluster Stars Project"
, volume 207, p. 80.05 -
2005
"VICS: Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster"
, volume 207, p. 80.04 -
2005
"VICS: Intergalactic Globular Clusters in Virgo"
, volume 207, p. 80.06 -
2005
"Upgrading the Ward Beecher Planetarium for the 21st Century"
, volume 207, p. 67.08 -
2005
"Measuring the Persistence of Stellar Variability using a Two Epoch Imaging Survey"
, volume 207, p. 122.08 -
2005
"Imaging Virgo's Diffuse Intracluster Light"
, volume 207, p. 177.02 -
2005
"Imaging and Spectroscopy of Large Scale H-alpha Filaments in M86"
, volume 207, p. 138.06 -
2005
"Hypervelocity intracluster stars ejected by supermassive black hole binaries"
arXiv e-prints, p. astro-h/0512344
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2005
"The Progenitors of the Brightest Planetary Nebulae"
, volume 804, p. 292-292 -
2005
"Diffuse Light in the Virgo Cluster"
\apjl, volume 631, issue 1, p. L41-L44
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2005
"The Planetary Nebula System of M74"
, p. 258 -
2005
"Close Binaries as the Progenitors of the Brightest Planetary Nebulae"
\apj, volume 629, issue 1, p. 499-506
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2005
"Binary Black Hole Ejections of Intracluster Planetary Nebulae"
, volume 36, p. 02.06 -
2004
"The Progenitors of the Brightest Planetary Nebulae in Elliptical Galaxies"
, volume 205, p. 138.03 -
2004
"New Results from an Intracluster Light Imaging Survey"
, volume 205, p. 146.01 -
2004
"Ly\ensuremath\alpha Emitters at z=3.1 in the Extended CDF-S/GOODS-S Field"
, volume 205, p. 62.01 -
2004
"Calibrating SN Type Ia in Early-Type Galaxies using the Planetary Nebulae Luminosity Function"
, volume 205, p. 69.06 -
2004
"Intracluster Planetary Nebulae in the Virgo Cluster. III. Luminosity of the Intracluster Light and Tests of the Spatial Distribution"
The Astrophysical Journal, volume 615, issue 1, p. 196-208
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2004
"The Planetary Nebula System of M33"
The Astrophysical Journal, volume 614, issue 1, p. 167-185
-
2004
"Searching for GRB Remnants in Nearby Galaxies"
, volume 727, p. 388-391 -
2004
"Intracluster Planetary Nebulae as Probes of Intracluster Starlight"
arXiv e-prints, p. astro-h/0407625
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2004
"Deep CCD Surface Photometry of Galaxy Clusters. II. Searching for Intracluster Starlight in Non-cD clusters"
\apj, volume 609, issue 2, p. 617-637
-
2004
"The Systematics of Intracluster Starlight"
, volume 217, p. 88 -
2004
"Results from a Diffuse Intracluster Light Survey"
, volume 217, p. 86 -
2004
"Intracluster Planetary Nebulae in Clusters and Groups"
, volume 217, p. 64 -
2004
"A CFH12K Survey of Red Giant Stars in the M81 Group"
, volume 217, p. 90 -
2004
"Using Intracluster Light to Study Cluster Evolution"
, p. 14 -
2003
"Searching for Intergalactic Stars in the M81 Galaxy Group"
, volume 203, p. 51.01 -
2003
"New Results from an Intracluster Star Imaging Survey"
, volume 203, p. 47.08 -
2003
"A Search for Stars in the M81 Group's HI Tidal Tails"
, volume 203, p. 115.22 -
2003
"Probing the Complex and Variable X-Ray Absorption of Markarian 6 with XMM-Newton"
\aj, volume 126, issue 1, p. 153-157
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2003
"VizieR Online Data Catalog: Virgo intracluster planetary nebula candidates (Feldmeier+, 2003)"
VizieR Online Data Catalog, p. J/AJS/145/65
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2003
"Probing the Complex and Variable X-ray Absorption of Markarian 6 with XMM-Newton"
, volume 7, p. 21.06 -
2003
"Intracluster Planetary Nebulae in the Virgo Cluster. II. Imaging Catalog"
The Astrophysical Journal Supplemental Series, volume 145, issue 1, p. 65-81
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2003
"Observing the formation of cD envelopes and intracluster light"
, p. 53 -
2003
"Kinematics of Planetary Nebulae in M51's Tidal Tail"
, volume 209, p. 633 -
2003
"Kinematics of Planetary Nebulae in M51's Tidal Debris"
The Astrophysical Journal, volume 582, issue 1, p. 170-183
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2003
"Intracluster Planetary Nebulae (invited review)"
, volume 209, p. 597 -
2003
"A Search for Intra-group Planetary Nebulae in the M81 Group"
, volume 209, p. 605 -
2002
"The Kinematics of M33's Disk Planetary Nebulae"
, volume 201, p. 13.11 -
2002
"Confirmation of SBS 1150+599A as an Extremely Metal-poor Planetary Nebula"
\aj, volume 124, issue 6, p. 3340-3347
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2002
"Planetary Nebulae as Standard Candles. XII. Connecting the Population I and Population II Distance Scales"
The Astrophysical Journal, volume 577, issue 1, p. 31-50
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2002
"Testing dwarf galaxy formation models using compact groups"
, p. 308 -
2002
"Searching for Intracluster Planetary Nebulae in the Dorado group"
, p. 239 -
2002
"Deep CCD Surface Photometry of Galaxy Clusters. I. Methods and Initial Studies of Intracluster Starlight"
\apj, volume 575, issue 2, p. 779-800
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2002
"Intracluster Red Giant Stars in the Virgo Cluster"
The Astrophysical Journal, volume 570, issue 1, p. 119-131
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2002
"The Properties of Intracluster Light and the Halos of cD Galaxies"
, p. 43 -
2002
"Intracluster Planetary Nebulae in Virgo: Photometric Selection, Spectroscopic Validation, and Cluster Depth"
\aj, volume 123, issue 2, p. 760-771
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2002
"A Measurement of the Contamination in [O III] \ensuremath\lambda5007 Surveys of Intracluster Stars and the Surface Density of z=3.13 Ly\ensuremath\alpha Galaxies"
\apj, volume 566, issue 2, p. 784-793
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2002
"Intracluster Planetary Nebulae"
arXiv e-prints, p. astro-h/0201452
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2001
"Kinematics of Planetary Nebulae in M51's Tidal Tail"
, volume 199, p. 52.02 -
2001
"Kinematics of Planetary Nebulae in M 51's Tidal Tail"
arXiv e-prints, p. astro-h/0112292
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2001
"A Search for Intra-group Planetary Nebulae in the M 81 Group"
arXiv e-prints, p. astro-h/0112435
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2001
"A Comparison Between Extragalactic Distances Derived From Cepheids, Planetary Nebulae, and Surface Brightness Fluctuations"
, volume 199, p. 139.02 -
2001
"A Measurement of the Contamination in [OIII] lambda 5007 Surveys of Intracluster Stars and the Surface Density of z=3.13 Ly-alpha Galaxies"
arXiv e-prints, p. astro-h/0110456
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2001
"Tracing the Atmospheric Source of Desert Nitrates Using \ensuremath\Delta $^{17}$O"
, volume 2001, p. B21A-08 -
2001
"Tracing the Atmospheric Source of Desert Nitrates Using (17O"
, p. 3895 -
2001
"The Properties of Intracluster Starlight in the Virgo Cluster and in the M 81 group"
, p. 101 -
2000
"Intracluster Stars in the Virgo Cluster"
, volume 197, p. 106.04 -
2000
"Intracluster Planetary Nebulae in the Fornax Cluster"
, volume 197, p. 106.07 -
2000
"First results from a Intracluster Light Survey"
, volume 197, p. 106.01 -
2000
"The Dependence of Intracluster Light on Cluster Environment"
, p. 186 -
2000
"A Survey of Intracluster Planetary Nebulae in the Virgo Cluster"
Pennsylvania State University -
2000
"Discovery of Nine Ly\ensuremath\alpha Emitters at Redshift z\raisebox-0.5ex\textasciitilde3.1 Using Narrowband Imaging and VLT Spectroscopy"
\apj, volume 536, issue 1, p. 19-30
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2000
"The Evolution of Starburst Galaxies Between z=2.8 and z=3.8"
, p. 234 -
2000
"Intracluster Planetary Nebulae in the Virgo Cluster"
, volume 197, p. 389 -
1999
"Setting a Limit on Contamination of Intracluster Star Surveys"
, volume 195, p. 80.05 -
1999
"Planetary Nebula Luminosity Function Distances to M 33, NGC 2403 and NGC 3627 and a Comparison to the Cepheid Distance Scale"
, volume 195, p. 11.03 -
1999
"From intracluster planetary nebulae to high-redshift Ly\ensuremath\alpha emitters."
The Messenger, volume 98, p. 50-52
-
1999
"A Search for Intracluster Planetary Nebulae in the Virgo Cluster"
, volume 195, p. 120.04 -
1999
"Intracluster planetary nebulae in the Virgo cluster."
Anglo-Australian Observatory Epping Newsletter, volume 91, p. 10
-
1999
"V4334 Sagittarii"
\iaucirc, volume 7155, p. 5
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1999
"Surveying Virgo's Intracluster Stars"
, p. 88 -
1999
"Obtaining the Kinematics of Virgo's Intracluster Stars"
, p. 317 -
1999
"Heavy and Complex X-Ray Absorption toward the Nucleus of Markarian 6"
\apj, volume 510, issue 1, p. 167-177
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1999
"Future Directions for the Planetary Nebula Luminosity Function"
, volume 167, p. 175-191 -
1998
"The Unusual Properties of the HII Region SP-44 in the Scd Galaxy NGC 2403"
, volume 193, p. 16.06 -
1998
"Planetary Nebulae and the Intracluster Stars of Virgo"
, volume 193, p. 38.18 -
1998
"Heavy and Complex X-ray Absorption in Markarian 6: A View Through a Torus Atmosphere?"
, volume 193, p. 06.11 -
1998
"Intracluster Planetary Nebulae in the Virgo Cluster. I. Initial Results"
\apj, volume 503, issue 1, p. 109-117
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1998
"The Planetary Nebula Luminosity Function of M87 and the Intracluster Stars of Virgo"
\apj, volume 492, issue 1, p. 62-73
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1998
"Intracluster Stars and the Galactic Halos of Virgo"
, volume 136, p. 87 -
1997
"Planetary Nebulae as Standard Candles. XI. Application to Spiral Galaxies"
\apj, volume 479, p. 231
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1996
"The Planetary Nebulae Distance to M101"
\apjl, volume 461, p. L25
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1995
"Planetary Nebula Distances to the Spiral Galaxies M51, M96, and M101"
, volume 187, p. 08.04 -
1994
"Constraining the Stellar Populations of Elliptical Galaxies with Planetary Nebulae"
, volume 185, p. 52.16 -
1992
"Three-Epoch VLBI Observations of the Nucleus in the Lobe-dominated Quasar 3C 334"
\apj, volume 393, p. 81
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Professional Service
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2011 - 2012
Committee Member
National Science Foundation, Math and Physical Sciences, Astronomy, Astronomy Portfolio Review Member
Washington, DC
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