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Hot Subdwarfs in Binaries: Multiwavelength Observations and Evolutionary Implications

Published online by Cambridge University Press:  12 April 2016

A. Ulla ,
P. Thejll ,
S. Vennes ,
C. S. Hansen-Ruiz  and
J. L. Rasilla
A. Ulla
Affiliation:
Niels Bohr Institute, Copenhagen, Denmark LAEFF-INTA, Madrid, Spain
P. Thejll
Affiliation:
Niels Bohr Institute, Copenhagen, Denmark
S. Vennes
Affiliation:
Center for Extreme Ultraviolet Astrophysics, Berkeley, USA
C. S. Hansen-Ruiz
Affiliation:
Institute of Astronomy, Cambridge, UK
J. L. Rasilla
Affiliation:
Instituto de Astrofísica de Canarias, Spain

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We are looking for stellar companions to very hot helium-rich subluminous (sdO) stars by using infrared photometry, optical CCD imaging and spectroscopy. The work is complemented with a comprehensive bibliographic and space-mission databanks search for the objects in our sample (Thejll, Ulla & MacDonald 1995). Companions can be used to indirectly measure the distance to the hot subdwarfs, and give clues about possible binary evolution scenarios. We have therefore gathered and analysed data for 57 hot subdwarfs in a search for IR excesses and companions. 43 of the stars are observed for the first time in the JHK bands and 28 objects are found to have larger IR fluxes than expected from a single sdO.

Type
Post Common Envelope Binaries & Evolution
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 469 - 470
Copyright
Copyright © Kluwer 1996

References

Saffer, R.A., Liebert, J., 1994, in “White Dwarfs”, Koester, D. and Werner, K. (eds.), >Springer Verlag, p 221 Google Scholar
Thejll, P.A., Ulla, A., MacDonald, J., 1995, A&A, 303, 773 Google Scholar