The complex and variable Xray spectra of the

The complex and variable X-ray spectra of the super-soft source RXJ 0513. 9 -6951 Vadim Burwitz (MPE) X-ray Grating Spectroscopy Workshop Grating Spectroscopy, Cambridge, MA, July 12, 2007 Vadim Burwitz Cambridge. X-ray MA, July 12, 2007

Talk Overview v Super Soft X-Ray Binaries (SSXBs) § RXJ 0513. 9 -6951 v Observations of RXJ 0513. 9 -6951 § LETGS observations § XMM RGS / EPIC v 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. XBs SS non-mass ejecting outbursts (recurrent sources) Novae Cassisi et al. 1998 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 1 st SSXBs Long, Helfand Grabelsky 1981, Columbia Astrophysics Laboratory • ROSAT RX J 0513. 9 -6951 among a total 12 sources • XMM-Newton Four new super-soft X-ray sources Kahabka, Haberl et al. 2006, 2007 Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

SSXBs as accreting binaries m. B = 16. 2 mag m. B = 16. 2 -16. 9 mag Porb=0. 76 days Porb= 1. 04 days I ~ edge on i = 25 deg RX J 0513 -69 CAL 83 m. B = 19 mag Porb=10. 6 hours I ~ edge on Our Sun for comparison CAL 87 van Teeseling, Kube

RXJ 0513 -69: long term optical lightcurve Southwell et al. 1996 Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

RXJ 0513 -69: X-ray and optical variability Reinsch et al. 2000

RX J 0513 -69: long-term variation model Hachiso & Kato 2003 Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

RX J 0513 -69: SMARTS monitoring 2005 Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

RX J 0513 -69: fits to LETGS data Blackbody model (30 -40 e. V, L~1038 erg/s) Single LTE WD model Planckian model + 4 and more Gaussians. . . Two LTE WD models Burwitz et al. 2007 Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

RX J 0513 -69 LETGS spectra Burwitz et al. in prep. Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

RGS-Spectra of RXJ 0513. 9 -6951 Mc. Gowan 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

Fλ (erg / cm 2 / s / Å) RX J 0513 -69 vs. other Super-soft sources λ (Å) Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007

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

XMM-Newton and Chandra observations of Cal 83 Paerels et al. 2001 Lanz et al. 2005 - 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 0513. 9 -6951 evolution during X-ray bright state § WD Atmosphere modeling • Possibly more atomic transitions need to be included • NLTE vs. LTE § Comparison with theoretical Models Vadim Burwitz X-ray Grating Spectroscopy, Cambridge, MA, July 12, 2007