The unusual X-ray and EUV flare activity of Wolf 630AB |
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| Authors: | B J Kellett V Tsikoudi |
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| Institution: | Space Science Department, Rutherford Appleton Laboratory, Chilton, OX11 0QX;Laboratory of Astronomy, Department of Physics, University of Ioannina, Ioannina, Greece |
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| Abstract: | We study the X-ray and extreme ultraviolet (EUV) behaviour of the flare star Wolf 630AB (V1054 Oph, Gl 644AB, HD 152751) using the ROSAT all-sky survey data from 1990 August. The simultaneous X-ray and EUV observations revealed a complex and unusual series of interplay. Indeed, the star was in a state of almost continuous flare activity for the two days of the X-ray observations. We saw a total of five X-ray flares (plus a subflare) and at least as many flares were also seen in the EUV data.
We suggest that the series of flares observed on Wolf 630AB originated in a single (probably complex) active region and illustrate, in a unique way, the evolution of flare activity in the stellar corona of a very active dMe star. |
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| Keywords: | stars: activity stars: flare stars: individual: Wolf 630AB stars: late-type – X‐rays: stars |
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