Component masses of young, wide, non-magnetic white dwarf binaries in the SDSS DR7

This work is based in part on observations made with the Gran Telescopio Canarias (GTC), operated on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The INT and the WHT are operated by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Based in part on observations made with ESO Telescopes at the La Silla Paranal Observatory under programme numbers 084.D-1097 and 090.D-0140. Based in part on observations obtained as part of the VISTA Hemisphere Survey, ESO Progam, 179.A-2010 (PI: McMahon). This research was made possible through the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund. This research has made use of the Simbad database, operated at the Centre de Donn´ees Astronomiques de Strasbourg (CDS), and of NASA’s Astrophysics Data System Bibliographic Services (ADS). Funding for the SDSS and SDSS-II was provided by the Alfred P. Sloan Foundation, with Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is http://www.sdss.org/. SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. NL acknowledges support from the national program number AYA2010-19136 funded by the Spanish Ministry of Science and Innovation. NL is a Ram´on y Cajal fellow at the IAC (number 08-303-01-02). Balmer/Lyman lines in the DA models were calculated with the modified Stark broadening profiles of Tremblay & Bergeron (2009), kindly made available by the authors.