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Astron. Astrophys. 319, 201-210 (1997)

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X-ray properties of symbiotic stars

II. Systems with colliding winds *

Urs Mürset 1, Burkhard Wolff 2 and Stefan Jordan 2

1 Institut für Astronomie, ETH Zentrum, CH-8092 Zürich, Switzerland (muerset@astro.phys.ethz.ch)
2 Institut für Astronomie und Astrophysik, Universität Kiel, D-24098 Kiel, Germany (wolff/jordan@astrophysik.uni-kiel.d400.de)

Received 14 June 1996 / Accepted 24 July 1996

Abstract

60% of the known galactic symbiotic stars are sufficiently X-ray bright to be detected in pointed ROSAT PSPC observations. We present observations of 16 symbiotic stars. We encounter three classes of pulse height distibutions: [FORMULA]) supersoft emission from the atmosphere of the hot star, [FORMULA]) emission from an optically thin plasma with a temperature of a few 106  K, and [FORMULA]) even harder emission, as from an accreting neutron star. In the present Paper we analyze the objects of type [FORMULA] in more detail. We find plasma temperatures ranging from [FORMULA]  K to [FORMULA]  K and luminosities from [FORMULA]   [FORMULA] to 0.4  [FORMULA].

Key words: binaries: symbiotic – stars: individual: EG And – stars: individual: PU Vul – stars: individual: Hen 1591 – stars: mass-loss – X-rays: stars

* Based on data collected with the ROSAT satellite

Send offprint requests to: U. Mürset

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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