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- W3121201889 abstract "We present XMM-Newton observations of γ2 Velorum (WR 11, WC8+O7.5III, P = 78.53 d), a nearby Wolf-Rayet binary system, at its X-ray high and low states. At high state, emission from a hot collisional plasma dominates from about 1 to 8 keV. At low state, photons between 1 and 4 keV are absorbed. The hot plasma is identified with the shock zone between the winds of the primary Wolf-Rayet star and the secondary O giant. The absorption at low state is interpreted as photoelectric absorption in the Wolf-Rayet wind. This absorption allows us to measure the absorbing column density and to derive a mass loss rate = 8 10-6 yr-1 for the WC8 star. This mass loss rate, in conjunction with a previous Wolf-Rayet wind model, provides evidence for a clumped WR wind. A clumping factor of 16 is required. The X-ray spectra below 1 keV (12 Å) show no absorption and are essentially similar in both states. There is a rather clear separation in that emission from a plasma hotter than 5 MK is heavily absorbed in low state while the cooler plasma is not. This cool plasma must come from a much more extended region than the hot material. The Neon abundance in the X-ray emitting material is 2.5 times the solar value. The unexpected detection of C v (25.3 Å) and C vi (31.6 Å) radiative recombination continua at both phases indicates the presence of a cool (~40 000 K) recombination region located far out in the binary system." @default.
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- W3121201889 date "2004-07-01" @default.
- W3121201889 modified "2023-09-26" @default.
- W3121201889 title "Wind clumping and the wind-wind collision zone in the Wolf-Rayet binaryγ2 Velorum" @default.
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- W3121201889 doi "https://doi.org/10.1051/0004-6361:20047035" @default.
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