Publikationsdatum:
2016-10-17
Beschreibung:
We have obtained simultaneous photometric and spectroscopic observations of the cataclysmic variable 1RXS J064434.5+334451. We have calibrated the spectra for slit losses using simultaneous photometry, allowing us to construct reliable Doppler images from Hα and He ii 4686-Å emission lines. We have improved the ephemeris of the object based on new photometric eclipse timings, obtaining HJD = 245 3403.759 533 + 0.269 374 46 E . Some eclipses present a clear internal structure, which we attribute to a central He ii emission region surrounding the white dwarf, a finding supported by Doppler tomography. This indicates that the system has a large inclination angle i = 78 ± 2°. We have also analysed the radial velocity curve from the emission lines to measure its semi-amplitude, K 1 , from Hα and He ii 4686 and derive the masses of the components M 1 = 0.82 ± 0.06 M , M 2 = 0.78 ± 0.04 M and their separation a = 2.01 ± 0.06 R . The Doppler tomography and other observed features in this nova-like system strongly suggest that this is a SW Sex type system.
Print ISSN:
0035-8711
Digitale ISSN:
1365-2966
Thema:
Physik
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