Identification of 13 DB + dM and 2 DC + dM binaries from theSloan Digital Sky Survey

2005/03/23 by Else van den Besselaar, E. J. M. van den Besselaar, G. H. A. Roelofs +5 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.1051/0004-6361:200500102

published as Astron.Astrophys. 434 (2005) L13 · 4 pages, 2 figures, accepted for publication in A&A Letters

arxiv created 2005/03/23 · openalex publication_date 2005/04/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

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.

Cited by

• Astrophysics in 2005

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