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Astron. Astrophys. 327, 252-264 (1997)

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Thermal condensations in large stellar coronal loops

J.M. Ferreira 1 and C.A. Mendoza-Brice no 2

1 Department of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, Scotland
2 Centro de Astrofísica Teórica, Facultad de Ciencias, Universidad de los Andes, Mérida, Venezuela

Received 29 November 1996 / Accepted 5 May 1997

Abstract

The equations ruling the thermal equilibrium along coronal loops on rapidly rotating solar-type stars are solved. The particular case of loops with lengths comparable or greater than a stellar radius is studied.

Depending on the base pressure, it is found that hot loops can exist either with very high coronal temperature (T [FORMULA]) or with a more solar like temperature (T [FORMULA]). Another type of solution consist of loops with a local temperature minimum at the summit which can be thought as representing a stellar slingshot prominence. A detailed study is presented and it is shown that these solutions are available in very general circumstances and without any special requirements such as those concerning the heating distribution along the loop or variations of the cross-sectional area.

The equilibrium structure of asymmetric loops is analysed. The maximum temperature of hot loops moves towards the loop leg with more heating, but surprisingly, depending on the parameters of the problem, the prominence solution can appear in either loop leg.

Key words: stars: magnetic fields – stars: coronae – plasmas

Send offprint requests to: J.M. Ferreira

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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