Astron. Astrophys. 336, 604-612 (1998)

Polarimetric observations of southern hemisphere young solar-type stars

D. Clarke ¹, R.A. Smith ¹ and R.V. Yudin <sup>2

1</sup> University Observatory, Acre Road, Glasgow, Scotland, UK
² Central Astronomical Observatory of Russian Academy of Sciences at Pulkovo, 196140 St. Petersburg, Russia

Received 13 March 1998 / Accepted 15 May 1998

Abstract

A report is given on some linear and circular polarimetric observations of young solar-type stars. Despite a somewhat high level of instrumental polarization, the measurements were able to detect polarizations or 0.01%. Temporal variability has been discovered for 59 Vir with an indication that circular polarization is also present. A polarization at a level of was found associated with the star SAO 251015. Marginal polarizations are also suspected for the stars HD 155555 and HD 1835. For SAO 154972 (TU Pyx), a sudden change in polarization occurred over some tens of minutes and an associated circular polarization was also detected.

Key words: polarization stars: 59 Vir; HD 155555; HD 1835; SAO 251015; Tu Pyx

Send offprint requests to: D. Clarke

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Contents

• 1. Introduction
• 2. The measurements
• 3. The results
  • 3.1. Statistical analyses
  • 3.2. The unpolarized reference
  • 3.3. The polarized reference stars
  • 3.4. The program stars
• 4. Discussion
  • 4.1. SAO 154972 - TU Pyx
  • 4.2. SAO 251015
  • 4.3. HD 115383 - 59 Vir
  • 4.4. HD 128400
  • 4.5. HD 155555
  • 4.6. HD 1835
• 5. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: July 20, 1998
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