Doppler tomography and photometry of the cataclysmic variable 1RXS J064434.5+334451

J. V. Hernández Santisteban, J. Echevarría, R. Michel, R. Costero

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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 46E. 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, K1, from Hα and He ii 4686 and derive the masses of the components M1 = 0.82 ± 0.06 M⊙, M2 = 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.
Original languageEnglish
Pages (from-to)104-113
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date14 Oct 2016
Publication statusPublished - Jan 2017


  • Accretion
  • Accretion discs
  • Methods: observational
  • Stars: individual: J0644+3344
  • Stars: individual: SW Sex
  • Novae
  • Cataclysmic variables


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