XMM-Newton X-ray observations of γ2 Velorum (WC8 + O7.5III)

Details XMM-Newton X-ray observations of γ2 Velorum (WC8 + O7.5III) XMM-Newton X-ray observations of γ2 Velorum (WC8 + O7.5III)

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.132..697r&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 132, p. 697-700.

Physics

Nuclear Physics

Scientific paper

The spectrum of the binary system γ2 Velorum (WC8 + O7.5III) has been observed with RGS and EPIC-MOS aboard XMM-Newton. The system shows a 'high state' when the O-star is between the Wolf-Rayet star and the observer (near periastron) and a 'low state' when most of the spectrum is absorbed by the dense stellar wind of the Wolf-Rayet star (near apastron). The spectrum has been model-led by a 4-T plasma, using SPEX. The absorption affects the hot temperature component (kT = 1.5 keV) that is formed by the collision of the Wolf-Rayet wind and the O-star wind, and the second hot component (kT = 0.65 keV) for which the origin is still unclear. Part of the spectrum is not sensitive to the absorption by the stellar wind. This concerns a low-temperature component (kT = 0.23 keV) and features that are produced by plasma that has been photoionized by X-ray radiation from the hot component. In the RGS spectrum features of Radiative Recombination Continua (RRC) of C VI and C V of this photoionized plasma are detected.

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