Photometry of the post-common-envelope binary PG 0308+096
Abstract
We present R- and H-band photometry of PG 0308+096. We demonstrate that the orbital modulation is consistent with that of a dwarf M star heated by a DA white dwarf within the constraints given by the kinematic parameters. By fitting the photometry with an irradiation model we determine that the radius of the white dwarf is 0.019<=R_wd<=0.026 R_ (90 per cent confidence). In order to derive these limits, we have developed a fitting procedure that takes account of the external constraints derived from the spectroscopic analysis by Saffer et al. We determine that the period of the system is 0.286654+/-0.00000078d, which is one of the cycle count aliases considered by Saffer et al. We show that the Hα emission from the surface of the red star can be modelled as either optically thick or thin, but in the latter case the red dwarf must have intrinsic emission.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- June 1996
- DOI:
- 10.1093/mnras/280.4.1277
- Bibcode:
- 1996MNRAS.280.1277S
- Keywords:
-
- BINARIES: CLOSE;
- STARS: INDIVIDUAL: PG 0308+096;
- STARS: LOW-MASS;
- BROWN DWARFS;
- WHITE DWARFS