Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3002h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #30.02; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We report a statistical study of an X-Ray emission toward Herbig AeBe stars of a large sample of 22 sources using Chandra. The choice of sources is thoroughly arbitrary as more than half of the observations are serendipitous. The sensitivity and high angular resolution of Chandra allow an unprecedented study of X-Ray emission toward Herbig AeBe stars. About 68% of the sample are detected in the X-Ray. The estimated luminosities are within the range Log Lx = 28 33 ergs/s, mostly higher than T Tauri stars, but overlapping the range of T Tauri stars. The estimated plasma temperatures are mostly in the soft X-Ray band. Comparing the X-Rays to the stellar properties, we deduce a ratio of Lx/Lbol = -5.4±1. This value is higher than OB stars but lower than lower-mass late stars. No apparent correlation was found with the stellar rotational velocity allowing us to exclude solar like magnetic activity as the origin of the X-Rays. The deduced wind kinetic energy is ≈100 times higher than LX, but our deduced temperatures are relatively high to be produced by such a kinetic energy. This suggests that the wind shock model does not appear to be responsible for the X-Rays. The X-Ray luminosity of Herbig AeBe stars when compared to T Tauri stars have a different distribution at an 82% confidence level; we suggest that the typical X-Ray emission of Herbig AeBe stars does not come from unseen late-type stars companions. If these X-Rays are emitted by the Herbig stars, they must have magnetic activity.
We acknowledge support from the Laboratory for Astronomical Imaging at the University of Illinois and NSF AST 0228953. We would like to thank Alessandro Gardini and Rosa Williams for their interesting comments.
Hamidouche Murad
Looney Leslie W.
Wang Shuang
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