Identification of 13 DB + dM and 2 DC + dM binaries from the Sloan Digital Sky Survey
Abstract
We present the identification of 13 DB + dM binaries and 2 DC + dM binaries from the Sloan Digital Sky Survey (SDSS). Before the SDSS only 2 DB + dM binaries and 1 DC + dM binary were known. At least three, possibly 8, of the new DB + dM binaries seem to have white dwarf temperatures well above 30 000 K which would place them in the so called DB-gap. Finding these DB white dwarfs in binaries may suggest that they have formed through a different evolutionary channel than the ones in which DA white dwarfs transform into DB white dwarfs due to convection in the upper layers.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2005
- DOI:
- 10.1051/0004-6361:200500102
- arXiv:
- arXiv:astro-ph/0503491
- Bibcode:
- 2005A&A...434L..13V
- Keywords:
-
- binaries: spectroscopic;
- white dwarfs;
- stars: late-type;
- stars: evolution;
- Astrophysics
- E-Print:
- 4 pages, 2 figures, accepted for publication in A&