Andrew Layden -- Academic Credentials

B.A. - Wesleyan University (1986)

Ph.D. - Yale University (1993)

Postdoctoral: Cerro Tololo Inter-American Observatory: I spent 3 years doing research and some observatory support (single-channel photometers and CCDs). CTIO is the Southern Hemisphere sister of Kitt Peak National Observatory in Tucson, AZ, and together with the Gemini Observatories (twin 8-meter telescopes), forms the ground-based core of the U.S. National Observatories (there is also a solar component). My research at CTIO focused on three observational projects to study the chemical abundances and kinematics of RR Lyrae stars in three distint regions of our Milky Way galaxy, in an effort to better understand how our Galaxy formed -- because of the massive amount of data I collected, all three projects are still underway. I also studied the newly-discovered Sagittarius Dwarf Galaxy, which in 1994 was found lurking behind the Bulge of our Galaxy, and which has replaced the Large Magellanic Cloud as the "closest known galaxy to our own". I like to think my time at Tololo was well-spent, but perhaps my most lasting legacy is Chucky, the Astro-Gnomer.

Postdoctoral: Dept. of Physics & Astronomy at McMaster University, in Hamilton, Ontario (Canada). Drs. Bill Harris and Doug Welch supported my study of old stellar populations in the Galaxy. In addition to starting a large project with Doug to survey the variable star populations of metal-rich globular clusters in the Milky Way, I completed a paper with Drs. Bob Hanson (UCO/Lick) and Suzanne Hawley (MSU) on the luminosity calibration of RR Lyrae stars using the method of statistical parallaxes. Bill and grad student Pat Durrell were co-investigators on a project to measure the structural and color properites of the nucleated dwarf elliptical NGC 5106 using the Hubble Space Telescope.

Postdoctoral: Afterwards, I recieved a Hubble Fellowship, which I took to the Department of Astronomy at the University of Michigan (faculty contact, Dr. Mario Mateo). Mainly, I continued the projects I had begun at CTIO and McMaster, with the help of undergraduates Laura Ritter and Ben Bowes. Laura and Ben did extensive photometry of the variable stars in NGC 6441 and NGC 6316, respectively. Ben stayed on for a summer and lent a hand on projects including RR Lyrae stars in M54, in and the Galactic halo. With Dr. Ata Sarajedini (SFSU), I measured the age of the globular cluster M54 in the Sagittarius Dwarf Galaxy (it is as old as Galactic globulars, indicating that they and Sgr formed at about the same time). I also published photometry of 102 RR Lyrae stars in the inner halo of the Galaxy, and with Stefanie Wachter (Washington), discovered that the suspected cataclysmic variable CG Muscae is actually a garden-variety RR Lyrae star.

Postdoctoral: In 1998, I transferred my Hubble Fellowship to the Department of Physics and Astronomy at the Bowling Green State University (faculty contact, Dr. John Laird), where I will start teaching as an Assistant Professor in Sept 1999. My research activities will focus on completing the study of the dE,N galaxy NGC 5206, the photometric study of M54 (main-sequence turnoff and RR Lyrae stars), the RR Lyrae kinematics projects begun at CTIO, and the globular cluster variable star survey.

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