ROSAT All-Sky Survey X-ray and EUV observations of YY Gem and AU Mic

Details ROSAT All-Sky Survey X-ray and EUV observations of YY Gem and AU Mic ROSAT All-Sky Survey X-ray and EUV observations of YY Gem and AU Mic

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319.1147t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 4, pp. 1147-1153.

Astronomy and Astrophysics

Astronomy

7

Stars: Activity, Stars: Flare, Stars: Individual: Yy Gem, Stars: Individual: Au Mic, Stars: Late-Type

Scientific paper

Simultaneous X-ray and extreme ultraviolet (EUV) (ROSAT XRT and WFC All-Sky Survey) observations of the highly active dMe flare stars YY Gem and AU Mic show that the two stars displayed an unusual type of flaring behaviour. We detect several X-ray and EUV flares superimposed on an enhanced and smoothly varying quiescent background. The two large impulsive-type X-ray flares on YY Gem reach peak X-ray luminosities of 1-1.6×1030ergs-1 and we estimate that they had similar integrated luminosities (~6-8×1033erg). AU Mic also produced several X-ray and EUV flares, with one very impulsive flare producing a 10-fold increase in XRT count rate. This flare was even larger than the YY Gem flares (peak LX of 2.4×1030ergs-1 and integrated LX of 1×1034erg). The LXLBol ratio for both stars is at the `saturation' limit found in rapidly rotating dwarfs and the most active RS CVn stars. We suggest that the gradually varying components are the result of a period of continuous, unresolved flaring activity. Alternatively, they may be the result of the emergence and subsequent decay of a new magnetic active region on the stellar surface of these stars.

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