A parameter study of the eclipsing CV in the Kepler field, KIS J192748.53+444724.5

作者：Littlefair S P^*; Dhillon V S; Gaensicke B T; Bours M C P; Copperwheat C M; Marsh T R

来源：Monthly Notices of the Royal Astronomical Society, 2014, 443(1): 718-724.

DOI：10.1093/mnras/stu1158

• binaries: close
• binaries: eclipsing
• stars: dwarf novae
• novae, cataclysmic variables

We present high-speed, three-colour photometry of the eclipsing dwarf nova KIS J192748.53+444724.5 (KISJ1927) which is located in the Kepler field. Our data reveal sharp features corresponding to the eclipses of the accreting white dwarf followed by the bright spot where the gas stream joins the accretion disc. We determine the system parameters via a parametrized model of the eclipse fitted to the observed light curve. We obtain a mass ratio of q = 0.570 +/- 0.011 and an orbital inclination of 84 degrees.6 +/- 0 degrees.3. The primary mass is M-w = 0.69 +/- 0.07 M-circle dot. The donor star%26apos;s mass and radius are found to be M-d = 0.39 +/- 0.04 M-circle dot and R-d = 0.43 +/- 0.01 R-circle dot, respectively. From the fluxes of the white dwarf eclipse, we find a white dwarf temperature of T-w = 23000 +/- 3000 K, and a photometric distance to the system of 1600 +/- A 200 pc, neglecting the effects of interstellar reddening. The white dwarf temperature in KISJ1927 implies the white dwarf is accreting at an average rate of (M) over dot = 1.4+/-0.8 x 10(-9) M-circle dot yr(-1), in agreement with estimates of the secular mass loss rate from the donor.

• 出版日期2014-9-1