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Blobrana


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Super-flare stars
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Title: Kepler super-flare stars: what are they?
Author: R. Wichmann, B. Fuhrmeister, U. Wolter, E. Nagel

The Kepler mission has led to the serendipitous discovery of a significant number of `super flares' - white light flares with energies between 10^33 erg and 10^36 erg - on solar-type stars. It has been speculated that these could be `freak' events that might happen on the Sun, too. We have started a programme to study the nature of the stars on which these super flares have been observed. Here we present high-resolution spectroscopy of 11 of these stars and discuss our results. We find that several of these stars are very young, fast-rotating stars where high levels of stellar activity can be expected, but for some other stars we do not find a straightforward explanation for the occurrence of super flares.

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Blobrana


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Kepler telescope studies star superflares

Nasa's Kepler space telescope has provided fresh insight on the colossal explosions that can afflict some stars.
These enormous releases of magnetic energy - known as superflares - could damage the atmosphere of a nearby orbiting planet, putting at risk any lifeforms that might reside there.
Fortunately, Kepler shows superflares to be much less frequent on slow-rotating stars like our Sun.
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Blobrana


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'Superflares' erupt on some Sun-like stars

Some middle-aged stars burn and rave like newborns, producing flares thousands of times as energetic as those we see on the Sun, according to the first large survey of these events.
Flares - up to 10 million times as energetic as the so-called Carrington event - have occasionally been observed on other stars. Unfortunately, observations so far have been spotty, with some coming from X-ray satellites and others from visual observations.
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