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11 papers · 2 filters
Composition of the Galactic bulge
Andrew McWilliam, R. Michael Rich
We present detailed abundance results for 9 Galactic bulge stars in Baade's Window, based on HIRES (R=45,000--60,000) spectra taken with the Keck I telescope. The alpha elements sh…
An Extended Star Formation History for the Galactic Center from Hubble Space Telescope/NICMOS Observations
Donald F. Figer, R. Michael Rich, Sungsoo S. Kim +2
We present Hubble Space Telescope (HST) Near-Infrared Camera and Multiobject Spectrometer (NICMOS) observations as evidence that continuous star formation has created much of the c…
Deep Photometry in a Remote M31 Major Axis Field Near G1
R. Michael Rich, David B. Reitzel, Puragra Guhathakurta +2
We present photometry from Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 parallel imagery of a remote M31 field at a projected distance of about 34 kpc from the nucleu…
Keck Spectroscopy of Red Giant Stars in the Vicinity of M31's Massive Globular Cluster G1
David B. Reitzel, Puragra Guhathakurta, R. Michael Rich
We present results from a Keck spectroscopic survey of red giants in a field near M31's major axis, ~34kpc in projection from the nucleus, near the globular cluster G1. We use mult…
Constraints on the Origin of Manganese from the Composition of the Sagittarius Dwarf Spheroidal Galaxy and the Galactic Bulge
Andrew McWilliam, R. Michael Rich, Tammy A. Smecker-Hane
The trend of [Mn/Fe] in the Galactic bulge follows the solar-neighborhood relation, but most stars in the Sagittarius dwarf spheroidal galaxy show [Mn/Fe] deficient by approximatel…
HST Snaphot Study of Variable Stars in Globular Clusters: Inner Region of NGC 6441
Barton J. Pritzl, Horace A. Smith, Peter B. Stetson +4
[Abridged] We present the results of a Hubble Space Telescope snapshot program to survey the inner region of the globular cluster NGC 6441 for its variable stars. A total of 57 var…
Searching for Variability in the Globular Cluster Messier 4
Robert D. Ferdman, Harvey B. Richer, James Brewer +11
Time-series data taken with the Hubble Space Telescope of a field six core radii (~5') from the center of the globular cluster Messier 4, and covering a period of about 10 weeks in…
The Galactic Inner Halo: Searching for White Dwarfs and Measuring the Fundamental Galactic Constant, Vo/Ro
Jasonjot S. Kalirai, Harvey B. Richer, Brad M. Hansen +9
We establish an extragalactic, zero-motion frame of reference within the deepest optical image of a globular star cluster, an HST 123-orbit exposure of M4 (GO 8679, cycle 9). The l…
Correlations of Globular Cluster Properties: Their Interpretations and Uses
S. G. Djorgovski, P. Cote, G. Meylan +7
Correlations among the independently measured physical properties of globular clusters (GCs) can provide powerful tests for theoretical models and new insights into their dynamics,…
LSR0602+3910 - Discovery of a Bright Nearby L-type Brown Dwarf
Samir Salim, Sebastien Lepine, R. Michael Rich +1
We report the discovery of LSR0602+3910, an L dwarf of class L1. The object was initially identified by Lepine et al. (2002) as a new high proper motion star lying close to the Gal…
The Stellar Content of M31's Bulge
Andrew W. Stephens, Jay A. Frogel, D. L. DePoy +6
In this paper we analyze the stellar populations present in M31 using nine sets of adjacent HST-NICMOS Camera 1 and 2 fields with galactocentric distances ranging from 2' to 20'. T…