The Herbig Ae star HD 163296 in X-rays

Details The Herbig Ae star HD 163296 in X-rays The Herbig Ae star HD 163296 in X-rays

2005-03-03

arxiv.org/abs/astro-ph/0503076v1

Astrophys.J. 628 (2005) 811-816

Astronomy and Astrophysics

Astrophysics

7 pages, to be published in ApJ, 20 June 2005

Scientific paper

10.1086/429984

Chandra X-ray imaging spectroscopy of the nearby Herbig Ae star HD 163296 at 100 AU angular resolution is reported. A point-like, soft (kT~0.5 keV), emission-line source is detected at the location of the star with an X-ray luminosity of 4.0e29 erg/s. In addition, faint emission along the direction of a previously-detected Ly-alpha-emitting jet and Herbig-Haro outflow may be present. The relatively low luminosity, lack of a hard spectral component, and absence of strong X-ray variability in HD 163296 can be explained as originating from optically-thin shock-heated gas accreting onto the stellar surface along magnetic field lines. This would require a (dipole) magnetic field strength at the surface of HD 163296 of at least ~100 G and perhaps as high as several kG. HD 163296 joins the T Tauri star TW Hya in being the only examples known to date of pre-main-sequence stars whose quiescent X-ray emission appears to be completely dominated by accretion.

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