Mathematics – Logic
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..950r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 950-966. Research supported by CEA and Junta Nacional de Investi
Mathematics
Logic
24
Galactic Structure, Horizontal Branch Stars, Milky Way Galaxy, Stellar Evolution, Astronomical Catalogs, Astronomical Spectroscopy, Color-Magnitude Diagram, F Stars, Giant Stars, Star Distribution, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
Three spectral indices based on the Rose (1984) system have been used to obtain the spectral type and surface gravity of each star, and Fe/H for all stars with spectral type later than F6, in a complete sample of stars down to B = 12.5 in a 5 x 5 deg field at the South Galactic Pole. While for B below 11 there are approximately equal numbers of early and late F stars, at B above 11 the early F stars vanish and leave an abrupt cut-on at spectral time F7 (B-V = 0.50). The distribution of the fainter late-F stars are compared with a simulated thick disk population based on the Hesser et al. (1987) BV photometry of the globular cluster 47 Tucanae; it is found that the majority of the thick disk population is as old as 47 Tucanae.
Agostinho Rui
Rose James A.
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