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9. New Spectroscopic Results on Subluminous Stars, V

Published online by Cambridge University Press:  14 August 2015

J. L. Greenstein
J. L. Greenstein*
Affiliation:
Hale Observatories, California Institute of Technology, Carnegie Institution of Washington

Abstract

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Determination of temperature and surface gravity by colors and hydrogen-line profiles have been carried out for hot halo stars. A narrow horizontal branch is found stretching to above 40000 K; the hot O subdwarfs show a nearly vertical sequence, dropping towards the hot white dwarfs.

Spectra for 285 white dwarf stars have been obtained, and the classification scheme is reviewed. Theoretical problems of these spectra remain, largely, unsolved.

The red subluminous stars found by Eggen were studied spectroscopically; among 68 stars only one new red degenerate star was found. The others are very metal-poor, high-velocity stars with large ultraviolet excess.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 42: White Dwarfs , 1971 , pp. 46 - 60
Copyright
Copyright © Reidel 1971 

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