Colour Indices of Flare Stars and the Inverse Compton Effect

Details Colour Indices of Flare Stars and the Inverse Compton Effect Colour Indices of Flare Stars and the Inverse Compton Effect

Nov 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970bott....5..255g&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 5, pp. 255-261 (1970) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

6

Stars: Flare, Radiation Mechanisms: Nonthermal, Photometry

Scientific paper

According to Gurzadyan (1965, 1968) the flare of cold dwarf stars is due to the spontaneous appearance of fast electrons over the stellar photosphere. Through an inverse Compton-effect between these electrons and the thermal photons part of the infrared radiation is changed into ultraviolet. A theoretical colour-colour diagram is developed for such a non-thermal radiation. A comparison of this diagram with the observed colours of UV Cet type flare stars, T Tauri stars and flare stars in Orion is carried out. It is shown that the T Tauri stars are in a permanent flaring state with a nearly constant degree of activity. NX Mon is a typical example of very intense permanent flare activity. The following evolutionary sequence is established: NX Mon type stars → Ordinary T Tauri stars to UV Cet flare stars The predicted value of U-B in the case of inverse Compton-effect can reach -1^m6.

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