Astron. Astrophys. 344, 101-104 (1999)

The rotation speed of the companion star in V395 Car (=2S0921-630)

T. Shahbaz  ^{*  1}, E. Kuulkers ¹, P.A. Charles ¹, F. van der Hooft ², J. Casares ³ and J. van Paradijs <sup>2

1</sup> Department of Astrophysics, Oxford University, Keble Road, Oxford, OX1 3RH, UK
² Astronomical Institute "Anton Pannekoek", University of Amsterdam and Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands
³ Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain

Received 17 November 1998 / Accepted 8 December 1998

Abstract

We have obtained high resolution optical spectroscopy of the accretion disc corona source 2S0921-630 (=V395 Car) that constrains the spectral type of the companion star to be most probably K0III . At 6500 Å the secondary star is found to contribute 25% to the observed flux. The absorption line spectrum of the K0III companion star is broadened (compared to template stars) by a projected rotational velocity of 659 km s^-1 (1-).

Key words: stars: neutron stars: individual: V395 Car stars: fundamental parameters stars: binaries: general

* Based on observations made at the European Southern Observatory, La Silla, Chile

Send offprint requests to: T. Shahbaz (tsh@astro.ox.ac.uk)

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations and data reduction
• 3. The V395 Car spectrum
• 4. The spectral type and rotational broadening of the companion star
• 5. Discussion
  • 5.1. Nature of the secondary star
  • 5.2. P-Cygni profiles?
  • 5.3. Comparison with other systems
• 6. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: March 10, 1999
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