X-ray variability of sigma Orionis young stars with ROSAT

Details X-ray variability of sigma Orionis young stars with ROSAT X-ray variability of sigma Orionis young stars with ROSAT

2009-03-27

arxiv.org/abs/0903.4814v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

AJ, in press

Scientific paper

We used the Aladin Virtual Obsrvatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cluster and a background galaxy. Five stars displayed unambiguous flares and had probabilities p_var >> 99% of being actual variables. Two of the detected flares were violent and long-lasting, with maximum duration of six days and amplitude of eight times above the quiescent level. We classified another four stars as possible X-ray variables, including the binary system formed by the B2Vp star sigma Ori E and its close late-type companion. This makes a minimum frequency of high-amplitude X-ray variability in excess of a day of 39% among sigma Orionis stars. The incidence of this kind of X-ray variability seems to be lower among classical T Tauri stars with mid-infrared flux excesses than among fast-rotating, disk-less young stars.

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