Other
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395..466l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. 466-474.
Other
40
Astronomical Spectroscopy, Dwarf Galaxies, Giant Stars, Spectrum Analysis, Stellar Evolution, Abundance, Color-Magnitude Diagram, Error Analysis, Fine Structure, Infrared Spectra, Metallicity
Scientific paper
We have determined the abundances of 14 giant stars with M (V) values between + 0.2 and - 2.5 V between 19.6 and 16.9 in the Draco dwarf galaxy, using a synthetic spectral analysis of the calcium infrared triplet and the strongest line (5183 A) of the magnesium b triplet. The average abundance of the galaxy is about - 1.9 +/- 0.4, with a range from about - 1.4 to - 2.4. As previously noted by Zinn and Kinman et al., the abundances seem to fall into two groups, one with an average (Ca, Mg/H) abundances near - 1.6 +/- 0.2 and the other - 2.3 +/- 0.2. These results confirm and, in two significant ways, extend other claims for an abundance spread. First, our study extends to stars about 1.5 mag fainter than previous spectroscopic studies and is thus less sensitive to uncertainties arising from rapid evolutionary or mixing processes near the peak luminosity of the red giant branch and asymptotic giant branch, or from modeling quite extended atmospheres. Second, our study is one of the few to use model atmosphere techniques to match absorption features. A discussion of the origin of the color range among Draco giants and other problems of understanding dwarf spheroidal galaxy formation and evolution is presented.
Bell Roger A.
Hesser James Edward
Lehnert Matthew D.
Oke Bev J.
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