Astron. Astrophys. 346, 432-436 (1999)

Doppler images of the pre-main sequence binary V824 Arae ^*

A.P. Hatzes ¹ and M. Kürster <sup>2

1</sup> McDonald Observatory, The University of Texas at Austin, Austin, TX 78712-1083, USA
² European Southern Observatory, Casilla 19001, Vitacura, Santiago 19, Chile

Received 28 September 1998 / Accepted 1 March 1999

Abstract

A time series of spectral observations are used to derive the spot distribution on both components of the active late-type binary system V824 Ara. Both stars show a spot distribution that is dominated by a polar spot whose center is displaced from the rotation axis of the star. This is similar to the spot distribution found on other young stars and may provide further support for the hypothesis that V824 Ara is a pre-main sequence binary. The Doppler images of both components appear to be mirror images of each other and this suggests that tidal forces may influence the spot distribution on these stars.

Key words: stars: binaries: spectroscopic stars: imaging stars: individual: V 824 Ara stars: pre-main sequence stars: starspots

* Based on observations collected at the European Southern Observatory

Send offprint requests to: Artie Hatzes (artie@astro.as.utexas.edu)

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations
• 3. Doppler imaging
  • 3.1. Pre-imaging data preparation
    • 3.1.1. Stellar parameters
    • 3.1.2. Deblending of stellar line profiles
  • 3.2. Component A image
  • 3.3. Component B image
• 4. Photometry
• 5. Discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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