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RX J2130.6+4710 - an eclipsing white dwarf - M-dwarf binary star | | P.F.L. Maxted
; T.R. Marsh
; L. Morales-Rueda
; M.A. Barstow
; P.D. Dobbie
; M.R. Schreiber
; V.S. Dhillon
; C.S. Brinkworth
; | | Date: |
10 Sep 2004 | | Subject: | astro-ph | | Affiliation: | 1,2), T.R. Marsh (3,2), L. Morales-Rueda (4,2), M.A. Barstow , P.D. Dobbie , M.R. Schreiber , V.S. Dhillon and C.S. Brinkworth ( Keele University, UK. University of Southampton, UK. University of Warwick, UK. University of Nijmegen, The Netherland | | 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. | | Source: | arXiv, astro-ph/0409251 | | Services: | Forum | Review | PDF | Favorites | |
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