Physics of our days

Flaring red dwarf stars: news from Crimea

Crimean Astrophysical Observatory, Nauchnyi, Crimea, Russian Federation

Important phenomena are briefly described which have recently been discovered in the Crimean studies of flaring red dwarf stars believed to be the most common type of variable stars in the Galaxy. These phenomena include (i) long-lived radiation from a blueshifted component in the ionized-helium λ 4686 Å emission line in the active state of one such star, (ii) a long-lived absorption component in the stellar flare light curves with a lifetime exceeding that of the conventional flare emission, and (iii) solarcycle-like activity periodicity of the star EV Lac, whose mass is only 0.3 solar masses. In theoretical terms, a red dwarf star spot model is constructed which, in contrast to the commonly accepted model, agrees well with the solar spot picture.

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Fulltext is also available at DOI: 10.1070/PU1998v041n08ABEH000430
PACS: 96.60.Qc, 97.10.−q, 97.20.−w, 97.30.−b (all)
DOI: 10.1070/PU1998v041n08ABEH000430
Citation: Gershberg R E "Flaring red dwarf stars: news from Crimea" Phys. Usp. 41 807–814 (1998)
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Оригинал: Гершберг Р Е «Вспыхивающие красные карликовые звезды — новости из Крыма» УФН 168 891–898 (1998); DOI: 10.3367/UFNr.0168.199808d.0891

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