Bibcode
Araujo-Betancor, S.; Gänsicke, B. T.; Hagen, H.-J.; Rodriguez-Gil, P.; Engels, D.
Bibliographical reference
Astronomy and Astrophysics, v.406, p.213-219 (2003)
Advertised on:
7
2003
Journal
Citations
30
Refereed citations
24
Description
We report the identification of the cataclysmic variable 1RXS
J062518.2+733433 as an intermediate polar. The orbital period of the
system is determined to be 283.0+/-0.2 min from the radial velocity
variation of Hα, measured in an extensive set of time-resolved
spectra. Differential optical photometry obtained over a base line of
three weeks reveals the presence of coherent variability with a period
of 19.788+/-0.002 min, which we suggest to be the white dwarf spin
period. The power spectrum of our photometry also contains a strong
signal near the spectroscopically-determined orbital period. The
emission lines in 1RXS J062518.2+733433 display a complex multicomponent
structure. In the trailed spectrogram of Line{He}{I}{6678} we detect a
narrow component with a radial velocity semi-amplitude of =~ 140 kms,
consistent with a possible origin on the irradiated face of the
secondary. The absence of eclipses gives an upper limit on the binary
inclination of ila60 o.