SIMBAD references

2000A&A...353..177M - Astronomy and Astrophysics, volume 353, 177-185 (2000/1-1)

A systematic analysis of X-ray variability of dM stars.


Abstract (from CDS):

We have systematically analyzed X-ray variability of dM stars. Our data base is the sample of all dM stars listed in the CNS3 (Gliese & Jahreiss, 1991NSC3..C......0G) catalog which have been observed with the ROSAT PSPC. Our data sample includes 86 pointed observations of 55 distinct stars or multiple systems. A large fraction of stars shows significant variations, regardless of their quiescent flux. Variability is detected on all observable time scales. The amplitudes of these variations are independent of both stellar X-ray and visual luminosity. Compared to solar X-ray variability properties our results suggest that the amplitude distribution of X-ray variability in dM stars is consistent with the analogous distribution for solar flares. We discuss the effect of variability on the spread observed in the X-ray luminosity function of M stars. The comparison of our data with those obtained with Einstein IPC shows that variations on time scales shorter than a few month are more common than long term variations comparable to, e.g., the 11 years solar cycle.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: late-type - X-rays: stars - Galaxy: solar neighbourhood

CDS comments: Table 1: CNS 783 = GJ 3294, CNS 1673 = GJ 3618.

Simbad objects: 64

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