Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..787r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, May 1985, p. 787-802.
Astronomy and Astrophysics
Astronomy
45
Galactic Structure, Horizontal Branch Stars, Metallic Stars, Milky Way Galaxy, Stellar Spectra, Color-Magnitude Diagram, Dwarf Stars, Main Sequence Stars, Peculiar Stars, Stellar Evolution, Stellar Luminosity, Stellar Motions, Stellar Spectrophotometry
Scientific paper
A class of red horizontal-branch (RHB) stars, similar to those in the "metal-rich" globular cluster M71, has been identified in the Galactic disk, using a quantitative three-dimensional spectral classification system developed earlier (Rose 1984) that uses 2.5-Å resolution spectra in the blue. A prototype for this class is the G5 III star HD 79452, which has been found by Helfer and Wallerstein (1968) to have [Fe/H] = -0.85 and MV = +1. The RHB stars are shown to be evolved stars on the basis of the strength of their Sr II λ4077 line, and are distinguished from post-main-sequence stars evolving through the same region of the HR diagram because of the unique appearance of their CN λ3883 and λ4216 bands. A preliminary estimate has been made of their space density, scale height perpendicular to the Galactic plane, and kinematics by surveying G5 - G7 stars in the Upgren (1962) North Galactic Pole survey.
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