Other
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1388f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, June 1987, p. 1388-1438.
Other
61
Astronomical Models, Galactic Evolution, Galactic Structure, Milky Way Galaxy, Stellar Spectrophotometry, Astronomical Spectroscopy, Giant Stars, Metallicity, Star Distribution, Stellar Luminosity
Scientific paper
The results of a spectroscopic survey of the stellar populations of high-Galactic latitude fields in SA 94 and Serpens are presented and analyzed. A set of six spectrophotometric indices is used to provide information on both the number and metallicity of evolved stars, while measurement of another 11 spectrophotometric indices provides an estimate of (Fe/H) good to 0.25 dex for the evolved stars identified in each field. A detailed comparison of the data with predictions of the standard Bahcall-Soneira Galaxy model reveals serious discrepancies. The properties of giants with roughly solar metallicity are described well by the disk giants predicted by the standard model. The sample is dominated by intermediate-metallicity giants whose properties are well described by a thick-disk component with scale height of approximately 700 pc that makes up about 5 percent of the solar neighborhood stellar density.
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