Statistics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..723w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 723-732.
Statistics
106
Abundance, Galactic Bulge, Galactic Nuclei, Giant Stars, K Stars, Late Stars, Metallicity, Milky Way Galaxy, Line Spectra, Metallic Stars
Scientific paper
The metallicity of 21 K giants in Baade's (1963) window has been determined by comparison of the strengths of strong iron lines and the Mg b feature with those in 22 calibration stars having high-resolution abundance analyses. The (J-K) colors were used to separate the effects of temperature and metallicity on line strengths. The majority of the stars are super-metal-rich with a mean aggregate forbidden Fe/forbidden H = 0.29 or 0.44 and an upper extreme forbidden Fe/forbidden H = 0.7 or 1.0, depending on the method of extrapolation for stars more metal-rich than any solar neighborhood calibration stars. These values for individual stars support the super-metal-rich explanation of very strong lines in the spectra of unresolved external galaxies. The minority fraction of metal-poor stars, for which aggregate forbidden Fe/forbidden H is about -1.0, includes the progenitors of Baade's RR Lyrae variables. The small-number statistics of the present sample leave the relative proportion of the metal-poor stars and their possible status as a separate group uncertain.
Rich Robert Michael
Whitford Albert E.
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