Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16..107r&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 3, p. 107-110
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Astronomical Spectroscopy, Binary Stars, Periodic Variations, X Ray Spectra, Light Curve, Magnetic Fields, Rosat Mission, Temporal Resolution, White Dwarf Stars, X Ray Astronomy
Scientific paper
We present optical spectroscopic and photometric results from the new polar binary, RXJ1940-10, whose periodic X-ray variations had, until its recent isolation in a ROSAT image, been confused with the signal from the Seyfert galaxy, NGC6814. A deep dip is observed in the optical light curves which possesses a previously unrecognized counterpart in the X-ray band. On balance, the X-ray and optical properties of this dip favour stream occultation of the emission site(s) rather than an eclipse by the secondary star. However, if so, the spectral characteristics of the dip egress suggest that the flow within the stream is inhomogeneous. The residual spectrum at dip minimum can be explained solely by an M4V star, yielding a distance of 230pc to RXJ1940-10. There is tentative evidence that RXJ1940-10 may be asynchronous.
Rosen Simon R.
Watson Michael G.
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