Swift Observations Of Four Symbiotic Star Systems

Details Swift Observations Of Four Symbiotic Star Systems Swift Observations Of Four Symbiotic Star Systems

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3507k&link_type=abstract

American Astronomical Society Meeting 210, #35.07; Bulletin of the American Astronomical Society, Vol. 39, p.149

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Symbiotic Stars are wind accreting white dwarf binary systems with a red giant companion that typically have binary separations of order of a few AU. These systems have complex X-ray spectra, usually requiring multiple thermal components to describe their spectra. Typically the X-ray spectra from Symbiotic Stars are soft (sometimes supersoft), however here we present results from Swift XRT and BAT observations of four symbiotic stars to be hard X-ray emitters: RT Cru, T CrB, CH Cyg and CD -57 3057. These objects have remarkably hard emission and are detected in the BAT all-sky survey at energies up to 100 keV. This hard X-ray emission appears to be thermal in nature, as evidenced by both the presence of strong Iron line emission and thermal continuum fits which reveal temperatures in the range of 5-20 keV. XRT observations of these sources in the 0.2-10 keV range reveal that they also may have rapidly variable soft X-ray emission, varying by a factor of 2-3 over timescales of a few days. Spectral fitting reveals that these systems require extremely high levels of localized absorption in order to adequately fit the soft X-ray spectrum. We present time dependent spectral modeling of the combined XRT and BAT data in the energy range of 0.2-150 keV for all four symbiotic star systems. We show that the soft X-ray variability seen in these objects may be explained by the presence of a variable localized absorber. We also discuss the possible origins of the hard thermal X-ray emission in these systems.

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