Disappearance of coronal X-ray emission in stars with cool dense winds

Article Abstract:

Many types of stars have been shown to have energetic X-ray coronae. However, as intermediate-mass stars evolve toward red giants, these coronae decrease and the presence of cool dense winds increases. Data from the Rosat all-sky survey has confirmed these observations. The density of these stellar winds is insufficient to account for the absorption of the emissions and absence of coronae. Thus, this change indicates a real evolutionary transition in stellar history.

X-ray astronomy, Stellar winds

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Continuous heating of a giant X-ray flare on Algol

Article Abstract:

The most likely explanation for the observations of a giant flare on Algol B, a giant star in an eclipsing binary system, is a solar-like reconnection scenario. The finding that the Algol flare took place above the south pole of Algol B is well aligned with the presence of 'polar spots' in many active binary systems that rotate very quickly. The flare has several features not seen in solar flares.

Algol (Star), Flare stars

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Ground-based observation of emission lines from the corona of a red-dwarf star

Article Abstract:

Research describing emission studies of red dwarf stars is presented. In particular telescope observations of the emission of highly ionized iron in the corona of CN Leonis are analysed.

Observations, Red dwarfs

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