X-ray variability of sigma Orionis young stars with ROSAT - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: We used the Aladin Virtual Obsrvatory tool and High Resolution Imager ROSATarchival data to search for X-ray variability in scale of days in 23 youngstars in the sigma Orionis cluster and a background galaxy.
Five starsdisplayed unambiguous flares and had probabilities p var >> 99% of being actualvariables.
Two of the detected flares were violent and long-lasting, withmaximum duration of six days and amplitude of eight times above the quiescentlevel.
We classified another four stars as possible X-ray variables, includingthe binary system formed by the B2Vp star sigma Ori E and its close late-typecompanion.
This makes a minimum frequency of high-amplitude X-ray variabilityin excess of a day of 39% among sigma Orionis stars.
The incidence of this kindof X-ray variability seems to be lower among classical T Tauri stars withmid-infrared flux excesses than among fast-rotating, disk-less young stars.



Author: J.
A.
Caballero, J.
Lopez-Santiago, E.
de Castro, M.
Cornide


Source: https://arxiv.org/



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