Hostname: page-component-77c89778f8-7drxs Total loading time: 0 Render date: 2024-07-17T14:00:40.957Z Has data issue: false hasContentIssue false
  • English
  • Français

Exosat Observations of H2252−035: Pulse Phase and Orbital Phase Dependent Low Energy Absorption and Iron Line Emission

Published online by Cambridge University Press:  12 April 2016

W. Pietsch ,
W. Voges ,
E. Kendziorra  and
M. Pakull
W. Pietsch
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Garching, F.R.G.
W. Voges
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Garching, F.R.G.
E. Kendziorra
Affiliation:
Astronomisches Institut der Universität Tübingen, F.R.G.
M. Pakull
Affiliation:
Institut für Astronomie und Astrophysik, TU Berlin, F.R.G.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
III. UV and X-Ray Observations
Information
International Astronomical Union Colloquium , Volume 93: Cataclysmic Variables: Recent Multi-Frequency Observations and Theoretical Developments , 1987 , pp. 281 - 292
Copyright
Copyright © Reidel 1987

References

King, A.R., Shaviv, G., 1984, Mon.Not.R.Astr.Soc. 211, 883 CrossRefGoogle Scholar
de Korte, P.A.J., Bleeker, J.A.M., den Boggende, A.J.F., Branduardi-Raymont, G., Brinkman, A.C., Culhane, J.L., Gronenschild, E.H.B.M., Mason, I., McKechnie, S.P., 1981, Space Sci.Rev. 30, 495 CrossRefGoogle Scholar
Motch, C., Pakull, M.W., 1981, Astron.Astrophys. 101, L9 Google Scholar
Patterson, J., Garcia, M., 1980, IAU Circ. 3514 Google Scholar
Pietsch, W., Pakull, M., Tjemkes, S., Voges, W., KendziOrra, E., van Paradijs, J., 1985, in: X-Ray Astronomy ‘84 (eds. Oda, M., Giacconi, R.), Tokio, 67 Google Scholar
Warner, B., 1986, Mon.Not.R.Astr.Soc. 219, 347 CrossRefGoogle Scholar
White, N.E., Marshall, F.E., 1981, Astrophys.J. 249, L25 CrossRefGoogle Scholar
van der Woerd, H., de Kool, M., van Paradijs, J., 1984, Astron.Astrophys. 131, 137 Google Scholar