SIMBAD references

2025ApJ...995...13G - Astrophys. J., 995, 13 (2025/December-2)

A Multiwavelength View of ρ Oph. I. Resolving the X-Ray Source between A and B.

GUNDERSON S.J., CODD J., GOLAY W.W., HUENEMOERDER D.P., CANNON J.M., FLUEGEL J.A., GRIFFIN P.E., HAURBERG N.C., IGNACE R., MORENO A., PRADHAN P., RIGGS A., WETZEL J., CANIZARES C.R. (The MACRO Consortium)

Abstract (from CDS):

We present a multiwavelength analysis of the central stellar pair of ρ 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 ρ Oph B, while ρ 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 ρ Oph A. An analysis of ρ 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 ρ Oph B is an Algol-like binary system, consisting of a B-type primary and an active, X-ray-emitting GK-type companion.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): High energy astrophysics - Stellar astronomy - Astrometry

Simbad objects: 11

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