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- W1488335034 abstract "We analyse the XMM-Newton observations of the close massive (O5V((f))+O9.5V) FO15 binary system. X-ray spectra are described by a combination of absorption models wabs (NISM H ) and absori (Nwind H ) with two absorbed thermal (apec) models (kT1=0.22±0.01 and kT2=1.43±0.40 keV) plus a non-thermal Power-Law (po) model (Γ=1.50±0.46). Observed emission lines from high ionization states of N, O, Ca, Si, Ne and Fe are produced by thermal plasma temperatures according to those obtained from our X-ray spectral fit model. The hard thermal component comes from the colliding wind region (CWR) of the primary stellar wind onto the secondary surface. We find Lx/Lbol is about 9.0×10−7 in excess with respect to the relation of single O-type stars, likely due to the CWR of the system. We estimate that CWR gas reaches the radiative limit, and mostly emits absorbed soft X-ray photons, while hard X-ray photons come from the inner part of the CWR throughout Inverse Compton (IC) scattering processes. Finally, we confirm the existence of short-term variability which seems to be related to radiative gas at the outer zones of the CWR, since the variability is only present in the soft X-ray band, while the hard X-ray emission remains constant." @default.
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- W1488335034 date "2005-11-01" @default.
- W1488335034 modified "2023-09-26" @default.
- W1488335034 title "X-ray analysis of the close binary system FO 15" @default.
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