Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219l...7b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. L7-L10.
Astronomy and Astrophysics
Astrophysics
15
Cataclysmic Variables, Stellar Spectrophotometry, X Ray Sources, Emission Spectra, Exosat Satellite, Spectral Line Width, Stellar Orbits, Visible Spectrum
Scientific paper
The identification of the serendipitous Exosat X-ray source EXO032957-2606.9 with a new probable long-period AM Herculis binary is reported. The orbital period is (228 + or - 1) min (1-sigma error). The classification as an AM Herculis binary is based on the very soft X-ray spectrum and the characteristics of the high-excitation optical spectrum. The spectrum is peculiar in that the radial-velocity amplitude is only 60 km/s and the line profiles exhibit persistent blue wings extending to -1000 km/s. The inclination of the system is small, and the prime accreting pole is permanently hidden from view. The variable soft X-ray flux originates from the second pole which faces the observer. Systems with such geometry are expected to exist and EXO032957-2606.9 would be the first to be identified. The secondary star was detected by its TiO bands and is approximately of spectral type dM4.5. The distance to the system is about 520 pc.
Beuermann Klaus
Giommi Paolo
Schwope Axel D.
Tagliaferri Giampiero
Thomas Hans-Christoph
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