The unusual X-ray and EUV flare activity of Wolf 630AB

Details The unusual X-ray and EUV flare activity of Wolf 630AB The unusual X-ray and EUV flare activity of Wolf 630AB

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.308..111k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 308, Issue 1, pp. 111-118.

Astronomy and Astrophysics

Astronomy

4

Scientific paper

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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