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On the Coronal Activity of RS CVn Systems

Published online by Cambridge University Press:  12 April 2016

Osman Demircan  and
Ethem Derman
Osman Demircan
Affiliation:
University Observatory, Science Faculty, 06100 Tandoğan, Ankara, Turkey
Ethem Derman
Affiliation:
University Observatory, Science Faculty, 06100 Tandoğan, Ankara, Turkey

Extract

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An analysis of the X-ray emission of a large sample of single MS stars shows that X-ray luminosity is strongly correlated with the photospheric radius (Fleming et al., 1989) which implies the dependence of activity on bolometric luminosity Lbol, effective temperature Teff, and thus stellar mass M (Micela et al., 1985; Bookbinder et al., 1986). The role of the emission area on the coronal activity of RS CVn systems has been noted independently by Majer et al. (1986), and Demircan (1986).

By using new data on some well known RS CVn systems, we produce new evidence that above idea is indeed valid. A plot of X-ray luminosity Lx versus (B – V) for the sample of well known RS CVn systems in Fig. 1 shows that cooler, long period, more evolved systems with larger surface area have stronger X-ray emission.

Type
Part IV Stellar activity
Information
International Astronomical Union Colloquium , Volume 130: The Sun and Cool Stars: activity, magnetism, dynamos , 1991 , pp. 501 - 503
Copyright
Copyright © Springer-Verlag 1991

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