SIMBAD references

2008ApJ...685..463K - Astrophys. J., 685, 463-477 (2008/September-3)

Investigating ChaMPlane X-ray sources in the Galactic bulge with Magellan LDSS2 spectra.

KOENIG X., GRINDLAY J.E., VAN DEN BERG M., LAYCOCK S., ZHAO P., HONG J. and SCHLEGEL E.M.

Abstract (from CDS):

We have carried out optical and X-ray spectral analyses on a sample of 136 candidate optical counterparts of X-ray sources found in five Galactic bulge fields included in our Chandra Multiwavelength Plane Survey. We use a combination of optical spectral fitting and quantile X-ray analysis to obtain the hydrogen column density toward each object, and a three-dimensional dust model of the Galaxy to estimate the most probable distance in each case. We present the discovery of a population of stellar coronal emission sources, likely consisting of pre-main-sequence, young main-sequence, and main-sequence stars, as well as a component of active binaries of RS CVn or BY Dra type. We identify one candidate quiescent low-mass X-ray binary with a subgiant companion; we note that this object may also be an RS CVn system. We report the discovery of three new X-ray-detected cataclysmic variables (CVs) in the direction of the Galactic center (at distances ≲2 kpc). This number is in excess of predictions made with a simple CV model based on a local CV space density of ≲10–5/pc3, and a scale height ∼200 pc. We discuss several possible reasons for this observed excess.

Abstract Copyright:

Journal keyword(s): Galaxy: Stellar Content - Stars: Novae, Cataclysmic Variables - Stars: Activity - Stars: Late-Type - Surveys - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJ/685/463): table5.dat>

Nomenclature: Table 7: [KGV2008] CV-A (Nos CV-A to CV-C).

Simbad objects: 151

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2020.09.21-12:59:01

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