EINSTEIN SSS Observations of Two Intermediate Polars

Details EINSTEIN SSS Observations of Two Intermediate Polars EINSTEIN SSS Observations of Two Intermediate Polars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9910s&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #99.10; Bulletin of the American Astronomical Society, Vol. 24, p.1277

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the Einstein Solid State Spectrometer (SSS) observations of two Intermediate Polars, EX Hydrae and TV Columbae. These data have revealed a new soft X-ray component in the spectra of both the objects. The spectrum of EX Hya is modeled with two temperature components, ~ 9 keV and ~ 0.74 keV optically thin plasma in collisional ionization equilibrium. The variation in the spectrum in phase with the 67 minute pulsation can be interpreted as arising due to excess absorbing material covering 40% of the emission region at the minimum phase, a modification of the ``accretion curtain model''. The spectrum of TV Col also reveals an excess at soft energies above the previously accepted thermal model ( ~ 15 keV), with a patchy absorber. This excess can be modeled with two optically thin thermal components with kT ~ 0.18 and ~ 0.75 keV. The spectrum is found to vary with the phase of the ~ 4 day period found in the optical photometry of this source. There is also evidence for the 32 minute pulsation, interpreted as the white dwarf spin period. The variation in the spectrum due to the 32 minute pulsation will be compared to the variations found in EX Hya due to the 67 minute pulsations.

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