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The periastron and X-ray eclipse of WR25 (WN6ha+O) (the most massive star in the Galaxy) A.M.T. Pollock (ESA@ESAC) & M.F. Corcoran (NASA/USRA@GSFC) Swift XRT 2008 February ToO campaign progress report The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain The Carina nebula in X-rays HD 93250 → ← HD 93129 Car → ← WR 25 The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain What’s so special about WR 25 ? Potsdam Wolf-Rayet IR-optical-UV models WR 25 M~110M The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain X-rays from colliding winds in Wolf-Rayet binaries X-ray emission is bright WR binaries >> single WR stars collisionless plasma physics chemical abundances (cf WR140) X-ray absorption is significant eclipses (cf WR140) mass-loss rates orbital geometry source size chemical abundances The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC WR 25 O WN6ha a ~ 2AU European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain What XMM has done with WR 25 The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain Gamen+’s double-lined orbit for WN6ha+O P = 207.85 ± 0.02 days e = 0.50 ± 0.02 = 215 ± 3 The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain X-ray absorption in WR25 WN6ha star The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain The Swift campaign Gamen+’s orbit periastron passage on 2008 February 111 Swift ToO campaign 2008 January 25 to 2008 March 16 32 daily sequences Two earlier archived observations of IGRJ10448-5945 Data analysis xrtpipeline 0.11.6 Xspec v12 with the XMM EPIC-MOS point-source model xspec> model constant()*wabs()*ISM*CWB(!) LX() nX() The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain The Swift XRT campaign Xspec analysis WR 25 LX nX The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain The Swift XRT campaign with WR25’s orbit WR 25 LX WR O WR O O WR nX The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain The Swift XRT campaign compared with XMM WR 25 LX with E-MOS0.6(?) 9 10 10 9 44 9 10 9 nX with E-MOS The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain The Swift XRT campaign conclusions WR 25’s colliding winds and D, the binary separation LX(D) increases smoothly to a maximum very near periastron there follows a complex X-ray eclipse (D) rapid 30% occultation Remission ~ Rabsorption ~ AU watch this space for the orbital inclination M(WN6ha) & M(O) O Of WNE WNL WC LX(WN6ha) is small Thanks to all at Swift; Alberto Moretti; and Aitor Ibarra. The X-ray eclipse of WR25 Andy Pollock XMM-Newton SOC European Space Astronomy Centre Villanueva de la Cañada, Madrid, Spain
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