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Astron. Astrophys. 343, 455-465 (1999)

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Detailed optical studies of the galactic supersoft X-ray source QR And (RX J0019.8+2156) *

B. Deufel 1,2, H. Barwig 2, D. imi 3, S. Wolf 2 and N. Drory 2

1 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany
2 Universitäts-Sternwarte München, Scheinerstrasse 1, D-81679 München, Germany
3 Max-Planck-Institut für Extraterrestrische Physik, Giessenbach Strasse 1, D-85740 Garching, Germany

Received 7 September 1998 / Accepted 2 December 1998

Abstract

We present high-speed long term photometric observations from 1992 to 1996 (UBVRI), as well as recently obtained (1997) spectrophotometric and high resolution spectroscopic studies of the bright galactic supersoft X-ray source RX J0019.8 +2156. Our photometry reveals a highly variable object. The shortest observed quasi-periodic variations are humps with a period of [FORMULA]1.8 h. The timings of the main minimum are not exactly regular and occur on average around phase [FORMULA] [FORMULA] 0.0. With our new data set we calculated an update of the orbital period.

Our simultaneous spectroscopic and spectrophotometric studies from 1997 give an even more detailed insight: blue and red shifted satellite lines at He II [FORMULA] 4686 and at the strong Balmer lines, which are interpreted as high velocity outflows, can clearly be detected. We also present for the first time an analysis of this supersoft source by means of Doppler tomography. The lines of He II ([FORMULA] 4542, 4686), [FORMULA] and [FORMULA] show no emission from an accretion disk. These emission lines originate in regions within the binary system with very low velocities. The spatial origin of the emitting material is not quite clear and will be investigated in a follow-up paper.

Key words: X-rays: stars – accretion, accretion disks – stars: individual: RX J0019.8 – stars: binaries: eclipsing – stars: binaries: close

* Based on observations at the German-Spanish Astronomical Center, Calar Alto, Spain and at the Wendelstein Observatory, Germany

Send offprint requests to: bed@mpa-garching.mpg.de

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© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999
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