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arXiv · astro-ph/0503076

The Herbig Ae star HD 163296 in X-rays

Douglas A. Swartz·Jeremy J. Drake·Ronald F. Elsner·Kajal K. Ghosh·Carol A. Grady·Edward Wassell·Bruce E. Woodgate·Randy A. Kimble
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Abstract

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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Douglas A. Swartz, Jeremy J. Drake, Ronald F. Elsner, Kajal K. Ghosh, Carol A. Grady, Edward Wassell, Bruce E. Woodgate, Randy A. Kimble. 2005-03-03. The Herbig Ae star HD 163296 in X-rays. https://doi.org/10.1086/429984

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