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The Origin and Evolution of Helium-Rich White Dwarfs

Published online by Cambridge University Press:  12 April 2016

James Liebert
James Liebert*
Affiliation:
Steward ObservatoryUniversity of ArizonaTucson, Arizona 85721USA

Abstract

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White dwarfs with helium-rich atmospheres constitute about one fifth of the white dwarfs hotter than 12,000 K. They appear to have a mass distribution similar to the hydrogen atmosphere (DA) stars, and are similar in other properties. However, the temperature distribution exhibits a deficiency of DB/DO stars in the interval 25,000-45,000 K, which implies evolution in the dominant surface composition as the stars cool. The hottest group of transition DO white dwarfs are the pulsating objects of the PG1159 class. The central star of Kl-16 is a related object, as may be the newly discovered very hot star H1504+65, which shows no detected surface features of either hydrogen or helium.

Type
VII Related Objects
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 367 - 385
Copyright
Copyright © Reidel 1986

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