Astron. Astrophys. 339, 840-845 (1998)

The relation between the magnetic field strength and the coronal temperature of cool stars

J.R. Shi ^{1, 2}, G. Zhao ¹, Yong-Heng Zhao ¹ and Jun-han You <sup>2

1</sup> Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, P.R. China
² Institute for Space Astrophysics, Department of Applied Physics, Shanghai Jiao Tong University, Shanghai 200030, P.R. China

Received 19 November 1997 / Accepted 17 August 1998

Abstract

The correlation between the coronal X-ray temperature and the magnetic field strength in late-type stars is investigated, based on data primarily from the ROSAT PSPC. According to the observation, we divide the stars into three groups: single, binary and RS CVn stars. From the sample of single stars, we find a clear correlation of the coronal temperature with the magnetic field strength. We interpret that result as the magnetic heating process.

Key words: stars: activity stars: coronae stars: late-type stars: magnetic fields X-rays: stars

Send offprint requests to: Jian-rong Shi, (shijr@hotmail.com)

SIMBAD Objects

Contents

• 1. Introduction
• 2. Program stars and data analysis
  • 2.1. Program stars
  • 2.2. Data analysis
• 3. Results
  • 3.1. One-temperature model
  • 3.2. Two temperature model
  • 3.3. Two temperature model with intervening absorption
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998
helpdesk.link@springer.de