RX J2130.6+4710 - an eclipsing white dwarf - M-dwarf binary star

Abstract

(Abridged) We report the detection of eclipses in the close white-dwarf - M-dwarf binary star RXJ2130.6+4710. We estimate that the spectral type of the M-dwarf is M3.5Ve or M4Ve. We estimate that the effective temperature of the white dwarf is Teff = 18000K +- 1000K. We have used the width of the primary eclipse and duration of totality measured precisely from Ultracam u' data combined with the amplitude of the ellipsoidal effect in the I band and the semi-amplitudes of the spectroscopic orbits to derive masses and radii for the M-dwarf and white dwarf. The M-dwarf has a mass of 0.555 +- 0.023 solar masses and a radius of 0.534 +- 0.053 solar radii, which is a typical radius for stars of this mass. The mass of the white dwarf is 0.554 +- 0.017 solar masses and its radius is 0.0137 +- 0.0014 solar radii, which is the radius expected for a carbon-oxygen white dwarf of this mass and effective temperature RXJ2130.6+4710 is a rare example of a pre-cataclysmic variable star which will start mass transfer at a period above the period gap for cataclysmic variables.

14 pages, 12 figures. Accepted for publication in MNRAS

Cited by in corpus (29)

• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• ULTRACAM: an ultra-fast, triple-beam CCD camera for high-speed astrophysics
• On the Correlation between the Magnetic Activity Levels, the Metallicities and the Radii of Low-Mass Stars
• Post-common-envelope binaries from SDSS. IX: Constraining the common-envelope efficiency
• Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
• On the Orbits of Low-mass Companions to White Dwarfs and the Fates of the Known Exoplanets
• Post Common Envelope Binaries from SDSS. I: 101 white dwarf main sequence binaries with multiple SDSS spectroscopy
• First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars
• Origin of apparent period variations in eclipsing post-common-envelope binaries
• A comprehensive population synthesis study of post-common envelope binaries
• Orbital Period Variations in Eclipsing Post Common Envelope Binaries
• Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test of Model Atmospheres
• Identification, Classifications, and Absolute Properties of 773 Eclipsing Binaries Found in the TrES Survey
• Post Common Envelope Binaries from SDSS. V: Four eclipsing white dwarf main sequence binaries
• Is the common envelope ejection efficiency a function of the binary parameters?
• The mass and radius of the M-dwarf in the short period eclipsing binary RR Caeli
• Long-term eclipse timing of white dwarf binaries: an observational hint of a magnetic mechanism at work
• The DWARF project: Eclipsing binaries - precise clocks to discover exoplanets
• Precise parameters for both white dwarfs in the eclipsing binary CSS 41177
• A Catalogue of Potential Post Common Envelope Binaries
• Fourteen new eclipsing white dwarf plus main-sequence binaries from the SDSS and Catalina surveys
• The pre-cataclysmic variable, LTT560
• DE CVn: A bright, eclipsing red dwarf - white dwarf binary
• 2MASS J01542930+0053266 : A New Eclipsing M-dwarf Binary System
• Wolf 1130: A Nearby Triple System Containing a Cool, Ultramassive White Dwarf
• The new pre-cataclysmic binary PG 2200+085
• The Applegate mechanism in Post-Common-Envelope Binaries: Investigating the role of rotation
• Discovery of a pre-cataclysmic binary with unusual chromaticity of the eclipsed white dwarf by the GPX Survey
• Component masses of young, wide, non-magnetic white dwarf binaries in the SDSS DR7