Resonant Scattering and Recombination in CAL 87

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dc.creatorGreiner, J.
dc.creatorIyudin, A.
dc.creatorJimenez-Garate, M.
dc.creatorBurwitz, V.
dc.creatorSchwarz, R.
dc.creatorDiStefano, R.
dc.creatorSchulz, N.
dc.date2004-03-17
dc.date.accessioned2026-07-07T02:12:39Z
dc.date.available2026-07-07T02:12:39Z
dc.descriptionThe eclipsing supersoft X-ray binary CAL 87 has been observed with Chandra on August 13/14, 2001 for nearly 100 ksec, covering two full orbital cycles and three eclipses. The shape of the eclipse light curve derived from the zeroth-order photons indicates that the size of the X-ray emission region is about 1.5 solar radii. The ACIS/LETG spectrum is completely dominated by emission lines without any noticeable continuum. The brightest emission lines are significantly redshifted and double-peaked, suggestive of emanating in a 2000 km/s wind. We model the X-ray spectrum by a mixture of recombination and resonant scattering. This allows us to deduce the temperature and luminosity of the ionizing source to be kT = 50-100 eV and L_X = 5E37 erg/s.
dc.descriptionTo appear in Proceedings of IAU Coll. 194 "Compact binaries in the Galaxy and beyond" (Rev. Mex. A&A Conf. Series), eds. G. Tovmassian and E. Sion
dc.identifierhttps://arxiv.org/abs/astro-ph/0403426
dc.identifierhttp://arxiv.org/abs/astro-ph/0403426
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7527
dc.subjectAstrophysics
dc.titleResonant Scattering and Recombination in CAL 87
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