Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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ASCA X-RAY OBSERVATIONS OF TWO CONTACT BINARIES: SW LACERTAE AND W URSAE MAJORIS

  • Choi, C.S. (Korea Astronomy Observatory) ;
  • Nam, U.W. (Korea Astronomy Observatory) ;
  • Kim, Y. (Department of Astronomy and Sapace Science, Chungbuk National University)
  • Published : 1997.06.01
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Abstract

We present X-ray light curves and the energy spectra for two contact binaries SW Lac and W UMa, which are obtained from the ASCA(Advanced Satellite for Cosmology and Astrophysics) observations. We find that both sources show appreciable flux variations during the observatoins, and the variations are erratic and are not orbital-phase dependent. From a spectral analysis, we also find that the W UMa spectrum can be reproduced by a variable-abundance plasma model with a single temperature of $T_1=6.8{\times}10^6K$, while the SW Lac spectrum requires two different temperatures $T_1=6.5{\times}10^6K$ and $T_2=1.4{\times}10^7K$.

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