Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-06-24T15:38:56.606Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Aznar Cuadrado, R., & Jeffery, C.S. 2001, A&A, 368, 994 Google Scholar
Aznar Cuadrado, R., & Jeffery, C.S. 2002, A&A, 385, 131 Google Scholar
Downes, R., Webbink, R.F., & Shara, M.M. 1997, PASP, 109 345 Google Scholar
Ferguson, D.H., Green, R.F., & Liebert, J. 1984, ApJ, 287, 320 Google Scholar
Howarth, I.D., & Heber, U. 1990, PASP, 102, 912 Google Scholar
Jeffery, C.S., & Aznar Cuadrado, R. 2001, A&A, 378, 936 Google Scholar
Jeffery, C.S., & Pollacco, D. 1998, MNRAS, 298, 179 Google Scholar
Kuczawska, E., Mikolajewski, M., & Kirejczyk, K. 1993, IBVS, 3845 Google Scholar
Lipunova, N.A., & Shugarov, S.Yu. 1990, JAVSO, 19, 40 Google Scholar
Lipunova, N.A., & Shugarov, S.Yu. 1991, IBVS, 3580 Google Scholar
Liu, W., & Hu, J.Y. 2000, ApJS, 128, 387 CrossRefGoogle Scholar
Orosz, J.A., Wade, R.A., & Harlow, J.J.B. 1997, AJ, 114, 317 Google Scholar
Rauch, T. 1993, A&A, 276, 171 Google Scholar
Wade, R.A., & Potter, D. 1995, BAAS, 27, 877 Google Scholar