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The Strange Story of BI Lyncis: an Extremely Helium-Rich Subdwarf with a Cool Companion

Published online by Cambridge University Press:  12 April 2016

C. Simon Jeffery  and
R. Aznar Cuadrado
C. Simon Jeffery
Affiliation:
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
R. Aznar Cuadrado
Affiliation:
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland

Abstract

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The star BI Lyn = PG 0900+400 was previously classified as an evolved binary system containing either a hot subdwarf or white dwarf and a thick accretion disk. We have analyzed new intermediate dispersion spectra and demonstrated that both views are wrong. BI Lyn is a highly-evolved system containing a luminous low-mass helium star and a rapidly rotating G-type giant. It may be closely related to the evolved sdO+G binary HD 128220.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 187: Exotic Stars as Challenges to Evolution , 2002 , pp. 59 - 64
Copyright
Copyright © Astronomical Society of the Pacific 2002

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