Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356..579m&link_type=abstract
Astronomy and Astrophysics, v.356, p.579-584 (2000)
Astronomy and Astrophysics
Astrophysics
5
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual: Rx J0925.7-4758, X-Rays: Stars
Scientific paper
We carried out optical spectroscopic observations of the galactic supersoft X-ray source RX J0925.7-4758. The relatively long orbital period among supersoft X-ray sources was confirmed. The nature of the secondary star is discussed using its invisibility in the optical spectrum. Under the hypothesis of a non-eclipsing white dwarf, we derived an A-G giant secondary with an inclination angle of 55deg +/- 10deg. Doppler maps of the He Ii lambda4686 and Hα emission lines were constructed, which generally resemble those of RX J0019.8+2156, suggesting a common line emitting region in supersoft X-ray sources. The concentration of the main emission region to low-velocities indicates that the mass function gives only a lower limit to the mass of the secondary star. Based on observations obtained at ESO La Silla Observatory (ESO Proposal 61.D-0397).
Matsumoto Katsumi
Mennickent Ronald E.
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