MAXI/GSC detection of a possible X-ray flare from an RS CVn star CF Tuc

Astronomy and Astrophysics – Astronomy

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X-Ray, Binary, Star, Transient, Variables

Scientific paper

On 2012-01-30 08:25:38 UT (=MJD 55956.351), the MAXI/GSC transient alert system triggered on enhanced X-ray emission from the position consistent with the CF Tuc (RS CVn system). The significant X-ray flux in the 2-20 keV band had been detected at 2012-01-30 03:45 (UT)(=MJD 55956.157) and activity continued about 3 hours. The maximum X-ray flux and the luminosity are about 60 mCrab and 2×1033 ergs/s in 2-20 keV band, respectively, if the distance is assumed to be 89 pc.

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