Kavli Affiliate: David P. Huenemoerder
| First 5 Authors: Sean J. Gunderson, Sean J. Gunderson, , ,
| Summary:
We present a multiwavelength analysis of the central stellar pair of $rho$
Oph, components A and B. Using recent high-resolution textitChandra X-ray
Observatory observations, we demonstrate with high confidence that the
dominant X-ray source is $rho$ Oph B, while $rho$ Oph A is comparatively
X-ray faint. This result contrasts with earlier textitXMM-Newton
observations, which, due to limited spatial resolutions, attributed the X-ray
emission to $rho$ Oph A. An analysis of $rho$ Oph B’s X-ray light curves and
spectra reveals properties more consistent with a cool star than a hot star. We
therefore propose that $rho$ Oph B is an Algol-like binary system, consisting
of a B-type primary and an active, X-ray-emitting GK-type companion.
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