Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-03
Astrophys.J.611:1107-1120,2004
Astronomy and Astrophysics
Astrophysics
22 pages, 5 figures, accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/422248
The extremely sensitive Chandra Deep Field-North (CDF-N) pencil-beam X-ray survey is used to identify and characterize the X-ray emission from old high-latitude main sequence Galactic stars. Our principal goal is to investigate the expected long-term decay of magnetic activity of late-type stars due to the gradual spindown of stellar rotation from a magnetized stellar wind. Eleven X-ray sources constitute a well-defined sample of 2 G, 2 K0-K4, and 7 M2-M5 stars with median distance around 300 pc. X-ray luminosities are typically log Lx ~ 27 erg/s and is dominated by flares rather than quiescent coronal emission. Models of the population indicates that the CDF-N stars are the most magnetically active old disk stars. A substantial decline in X-ray luminosities over the 1
Alexander Dave M.
Bauer Franz Erik
Brandt Wiliam N.
Cambridge
ESTEC
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