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XMM-Newton observations of the sigma Ori cluster. II. Spatial and spectral analysis of the full EPIC field | | E. Franciosini
; R. Pallavicini
; J. Sanz-Forcada
; | | Date: |
7 Oct 2005 | | Affiliation: | INAF/Osservatorio Astronomico di Palermo, Italy, Astrophysics Division-ESA, ESTEC, The Netherlands | | Abstract: | We present the results of an XMM-Newton observation of the young (~2-4 Myr) cluster around the hot star sigma Orionis. In a previous paper we presented the analysis of the RGS spectrum of the central hot star; here we discuss the results of the analysis of the full EPIC field. We have detected 175 X-ray sources, 88 of which have been identified with cluster members, including very low-mass stars down to the substellar limit. We detected eleven new possible candidate members from the 2MASS catalogue. We find that late-type stars have a median log L_X/L_bol ~ -3.3, i.e. very close to the saturation limit. We detected significant variability in ~40% of late-type members or candidates, including 10 flaring sources; rotational modulation is detected in one K-type star and possibly in another 3 or 4 stars. Spectral analysis of the brightest sources shows typical quiescent temperatures in the range T_1 ~ 0.3-0.8 keV and T_2 ~ 1-3 keV, with subsolar abundances Z ~ 0.1-0.3 Z_sun, similar to what is found in other star-forming regions and associations. We find no significant difference in the spectral properties of classical and weak-lined T Tauri stars, although classical T Tauri stars tend to be less X-ray luminous than weak-lined T Tauri stars. | | Source: | arXiv, astro-ph/0510209 | | Services: | Forum | Review | PDF | Favorites | |
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