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Article Dans Une Revue Astronomy and Astrophysics Supplement Series Année : 2005

COUP census of X-ray stars in BN-KL and OMC-1S

Résumé

We present a study of the X-ray sources detected in the vicinity of two density peaks in the Orion Molecular Cloud 1 behind the Orion Nebula Cluster (ONC), as seen in the exceptionally deep (~10 days) exposure of the Chandra Orion Ultradeep Project (COUP). We focus on a 40"*50" region around the Becklin-Neugebauer object and Kleinmann-Low nebula (collectively BN-KL) and a 60"*75" region around OMC-1S. Forty-three and sixty X-ray sources were detected in BN-KL and OMC-1S, respectively, of which half and one-third, respectively, were found to be foreground members of the ONC, while the remaining sources are identified as obscured X-ray sources. All but 5 and 18 of these sources have near-infrared stellar counterparts, and 22 of these appear to be young stellar objects (YSOs). X-ray sources are found close to four luminous mid-IR sources namely BN, IRc3-i2, IRc2-C, and Source n; their X-ray variability and spectral properties are typical of coronal activity in low-mass stars rather than wind emission from massive stars, suggesting that the X-ray emission may be arising from companions. The X-ray light curve of the X-ray source close to BN shows a periodicity of ~8.3 days and from an X-ray image deconvolution of the region around BN, we conclude that either BN itself or a low mass companion with a projected separation of ~200 AU was detected (abridged).
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Dates et versions

hal-00004642 , version 1 (06-04-2005)

Identifiants

Citer

Nicolas Grosso, Eric D. Feigelson, Konstantin V. Getman, Leisa Townsley, Patrick Broos, et al.. COUP census of X-ray stars in BN-KL and OMC-1S. Astronomy and Astrophysics Supplement Series, 2005, 160, pp.530-556. ⟨10.1086/432101⟩. ⟨hal-00004642⟩
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