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

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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 2

1 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


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)

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© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998