Transcript X-rays from Wolf-Rayet binaries - XMM

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 111
 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-MOS0.6(?)
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