Exosat observations of H2252-035: Pulse phase and orbital phase dependent low energy absorption and iron line emission |
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| Authors: | W Pietsch W Voges E Kendziorra M Pakull |
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| Institution: | (1) Max-Planck-Institut für Extraterrestrische Physik, Garching, F.R.G.;(2) Astronomisches Institut der Universität Tübingen, F.R.G.;(3) Institut für Astronomie und Astrophysik, TU Berlin, F.R.G. |
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| Abstract: | The 805 sec pulsing X-ray source H2252-035 has been observed for 7 h on September 14/15 and on September 17, 1983 in X-rays with the low energy telescope and the medium energy detectors of EXOSAT. While below 2 keV the semiamplitude of the 805 s pulses is  100% in the 2.3–7.9 keV band it is only 40%. X-ray dips that are more pronounced in low energies occur simultaneously with the orbital minimum of the optical light curve. The medium energy spectra during dips with respect to the non dip spectrum can be explained by just enhanced cold gas absorption of an additional absorbing column of 2 1022 cm–2. Model spectra for the 805 s minimum have to include a strong iron emission line at 6.55 keV with an equivalent width of 3 keV in addition to a reduced continuum intensity (radiating area) and enhanced low energy absorption.Paper presented at the IAU Colloquium No. 93 on  Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments , held at Dr. Remeis-Sternwarte Bamberg, F.R.G., 16–19 June, 1986. |
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