The Precataclysmic Binary RR Caeli Revisited: Spectroscopy and Light-Curve Synthesis

Other

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

20

Stars: Binaries: Eclipsing, Stars: Individual (Rr Caeli), Stars: Variables: Other

Scientific paper

Time-resolved spectroscopic observations of the precataclysmic binary RR Cae in the red make it possible to measure the radial velocity (RV) curve of this late-type secondary star and its Hα emission component. The latter is not caused by the illumination of the secondary star by the white dwarf, as in other precataclysmic binaries, but is intrinsic to the late-type star. The phasing of the RV curve allows for an improved measurement of the orbital period. Although still lacking RV measurements of the white dwarf primary, the present observations, together with a reanalysis of previous photometric measurements with the Wilson-Devinney light curve synthesis routine, permit improved determinations of many system parameters. Component masses are found to be 0.467 M_solar and 0.095 M_solar for the primary and the secondary stars, respectively. The radius of the secondary star, at 0.189 R_solar, is considerably larger than expected for such a low-mass star, possibly as a consequence of a previous common envelope phase. An orbital eccentricity, although strongly suggested by the shape of the light curve, is not supported by the RV curve. RR Cae is an eclipsing binary with two spectral line systems, which makes it possible to measure the component masses directly. This is of particular importance for the red dwarf secondary, which is of a later spectral type and probably of lower mass than any other known star for which such measurements are possible.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

The Precataclysmic Binary RR Caeli Revisited: Spectroscopy and Light-Curve Synthesis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Precataclysmic Binary RR Caeli Revisited: Spectroscopy and Light-Curve Synthesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Precataclysmic Binary RR Caeli Revisited: Spectroscopy and Light-Curve Synthesis will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1497492

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.