The Pre-He White Dwarfs in Eclipsing Binaries. I. WASP 0131+28
The Pre-He White Dwarfs in Eclipsing Binaries. I. WASP 0131+28
We report the first $BV$ light curves and high-resolution spectra of the post-mass transfer binary star WASP 0131+28 to study the absolute properties of extremely low-mass white dwarfs. From the observed spectra, the double-lined radial velocities were derived, and the effective temperature and rotational velocity of the brighter, more massive …