A Multiwavelength View of Oph I: Resolving the X-ray Source Between A and B
Abstract
We present a multiwavelength analysis of the central stellar pair of Oph, components A and B. Using recent high-resolution Chandra X-ray Observatory observations, we demonstrate with high confidence that the dominant X-ray source is Oph B, while Oph A is comparatively X-ray faint. This result contrasts with earlier XMM-Newton observations, which, due to limited spatial resolutions, attributed the X-ray emission to Oph A. An analysis of 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 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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