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
2005 Astrophysical Journal  
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
more » ... 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.
doi:10.1086/429984 fatcat:6mpmymorvjftvir5jf6lnhvhlu