Astron. Astrophys. 362, 973-977 (2000)

The massive Wolf-Rayet binary LSS 1964 (= WR 29)

V.S. Niemela ^* and R.C. Gamen ^**

Facultad de Ciencias Astronómicas y Geofísicas, U.N. La Plata, Paseo del bosque s/n, 1900 La Plata, Argentina

Received 4 July 2000 / Accepted 14 September 2000

Abstract

We present a radial velocity study of LSS 1964 (= WR 29) based on digital spectral images obtained with the 2.15-m telescope at CASLEO, San Juan, Argentina, between 1997 and 2000. We find this star to be a double-lined WN + O binary with a period of 3.16415 days. The WN component appears to be more massive than the O type component. NIV absorption at 5203 Å is found to belong to the WN7 star.

Key words: stars: binaries: spectroscopic stars: individual: WR 29 stars: Wolf-Rayet

* Member of Carrera del Investigador, CIC, Provincia de Buenos Aires, Argentina
** Fellow of CONICET, Argentina

Send offprint requests to: rgamen@fcaglp.fcaglp.unlp.edu.ar

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Contents

• 1. Introduction
• 2. Observations
• 3. Results and their discussion
  • 3.1. The spectrum of WR 29
    • 3.1.1. The WN7 component
    • 3.1.2. The OB component
  • 3.2. The radial velocity orbit
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: October 30, 2000
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