Superflaring on an Old Binary

Details Superflaring on an Old Binary Superflaring on an Old Binary

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0154k&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.54; Bulletin of the American Astronomical Society, Vol. 38, p.338

Astronomy and Astrophysics

Astronomy

Scientific paper

It has been well established that stellar activity decreases with the age of the star. Unlike young stars, where large flares are routinely found, both the X-ray luminosity as well as the frequency and intensity of flares decreases as a star ages on the main sequence. Here we describe a counter-example to the general trend, where a remarkably strong flare is seen in an old active binary during Chandra/ACIS observations of the globular cluster 47 Tuc (Heinke et al. 2005, ApJ 625, 796). The flare reaches a luminosity as high as 1032 ergs/s, reminiscent of superflare luminosities found with protostars (Grosso et al. 1997; Imanishi et al. 2001), and at temperatures that approach 100 MK. We carry out detailed spectroscopic analysis to determine the physical structure and energetics of the flaring.
This research was supported by NASA contract NAS8-39073 to the Chandra X-ray Center.

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