Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 The complex and variable X-ray spectra of the super-soft source RXJ Vadim Burwitz (MPE) X-ray Grating Spectroscopy Workshop Cambridge MA, July 12, 2007

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 Talk Overview  Super Soft X-Ray Binaries (SSXBs)  RXJ  Observations of RXJ  LETGS observations  XMM RGS / EPIC  Comparison with other SSXBs

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 White dwarfs at high accretion rates  Eddington rate  Red Giant configuration  Steady H-burn.  non-mass ejecting outbursts (recurrent sources)  Novae Cassisi et al SSXBs

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 Discovery of SSXBs in LMC X-ray survey of LMC by Einstein  Cal 83 & Cal 87 discovered 1st SSXBs Long, Helfand Grabelsky 1981, Columbia Astrophysics Laboratory ROSAT  RX J among a total 12 sources XMM-Newton  Four new super-soft X-ray sources Kahabka, Haberl et al. 2006, 2007

SSXBs as accreting binaries CAL 83 RX J CAL 87 Our Sun for comparison van Teeseling, Kube m B = 16.2 mag P orb =0.76 days I ~ edge on m B = mag P orb = 1.04 days i = 25 deg m B = 19 mag P orb =10.6 hours I ~ edge on

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RXJ : long term optical lightcurve Southwell et al. 1996

RXJ : X-ray and optical variability Reinsch et al. 2000

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RX J : long-term variation model Hachiso & Kato 2003

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RX J : SMARTS monitoring 2005

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RX J : fits to LETGS data Blackbody model (30-40 eV, L~10 38 erg/s) Single LTE WD modelTwo LTE WD models Burwitz et al Planckian model + 4 and more Gaussians...

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RX J LETGS spectra Burwitz et al. in prep.

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RGS-Spectra of RXJ McGowan et al. 2005

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 Comparison with the Hachisu and Kato Models

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 RX J vs. other Super-soft sources λ (Å) F λ (erg / cm 2 / s / Å)

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 LETGS eclipse spectrum of Cal 87 O VII Resonance line O VIII Ly a red shifted & double peaked  Wind outflow 2200 km/s Fe XVII  recombination emm. resonant scattering recombination recombination continua Greiner et al. 2004

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 XMM-Newton and Chandra observations of Cal 83 Paerels et al Lanz et al RGS - LETGS

Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007 Summary  Optical Monitoring (SMARTS) For triggering TOOs (Chandra/XMM) To study the long-term behavior of these objects  X-ray observations of SSXBs Needed to study the nature of the outbursts RXJ evolution during X-ray bright state  WD Atmosphere modeling Possibly more atomic transitions need to be included NLTE vs. LTE  Comparison with theoretical Models