Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713403s&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #134.03; Bulletin of the American Astronomical Society, Vol. 33, p.719
Other
Scientific paper
Using the Low Resolution Spectrograph (LRS) on the Hobby-Eberly Telescope, we have observed 18 candidate metal-rich giants -- selected on the basis of color magnitude diagrams and proper motion surveys -- in the direction of the dwarf spheroidal galaxies Draco and Ursa Minor. All of our program objects lie redward of the nominal red giant branch (RGB), and could therefore be either nonmembers, carbon stars, or members of an old metal-rich component. Our spectra have sufficient signal-to-noise to measure radial velocities and provide approximate spectral classifications for these objects. Comparing our velocities for stars in common with previous medium-resolution studies, we find an average difference of 10 km/sec with a standard deviation of 11 km/sec. This level of accuracy corresponds to less than a tenth of a pixel in the high resolution mode of the LRS. In Ursa Minor, we find two nonmembers and confirm the radial velocity membership of another five stars. One of these stars is a known carbon star which lies redward of RGB; three other previously unidentified carbon stars are also reported. The fifth star is a red giant previously observed by Shetrone et al. 2001, who found it to have [Fe/H] = -1.68. In Draco, we find eight nonmembers, confirm the membership of one known carbon star, and find two new members. One of these stars is a carbon star, while the other shows little evidence for C2 bands. We constrain its abundance to be lower than [Fe/H] = -1.2, and conclude that there is no evidence in our small sample for an old metal-rich population in either of these galaxies. This work is based on observations obtained with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximillians-Universität München, and Georg-August-Universität Göttingen.
Cote' Patrick
Shetrone Mathew D.
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