Emissions from the transition regions and coronae of three cool dwarf stars

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Fernández Figueroa, María José and Castro Rubio, Elisa de and Rego Fernández, Manuel (1983) Emissions from the transition regions and coronae of three cool dwarf stars. Astronomy & Astrophysics, 119 (2). pp. 243-247. ISSN 0004-6361

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Official URL: http://adsabs.harvard.edu/abs/1983A%26A...119..243F




Abstract

Ultraviolet emissions of τCet, δPav, and 61 Cyg A have been analysed to determine the structure of their outer atmospheres.
Emission line fluxes are used to find the emission measure distributions. Using two boundary values of the electron pressure, models of the transition region have been derived. In the two models of τCet the net conductive flux is less than the radiation losses at all temperatures. However, for δPav and 61 Cyg A the model with the upper boundary value of the electron pressure has a temperature range where the radiative losses are less than the net conductive fluxes. Measured X-ray fluxes are used to test the coronal temperature values derived from the ultraviolet observations.


Item Type:Article
Additional Information:

© European Southern Observatory.
We would like to thank an anonymous referee for useful comments.

Uncontrolled Keywords:Transition region; Corona; X-ray emission
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:32923
Deposited On:09 Oct 2015 13:23
Last Modified:10 Dec 2018 15:05

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