publication . Preprint . Article . 2010

Binaries discovered by the SPY project V. GD 687 - a massive double degenerate binary progenitor that will merge within a Hubble time

Stephan Geier; Ulrich Heber; Thomas Kupfer; R. Napiwotzki;
Open Access English
  • Published: 22 Mar 2010
Abstract
Aims. The ESO SN Ia Progenitor Survey (SPY) aims at finding merging double degenerate binaries as candidates for supernova type Ia (SN Ia) explosions. A white dwarf merger has also been suggested to explain the formation of rare types of stars like R CrB, extreme helium or He sdO stars. Here we present the hot subdwarf B binary GD 687, which will merge in less than a Hubble time. Methods. The orbital parameters of the close binary have been determined from time resolved spectroscopy. Since GD 687 is a single-lined binary, the spectra contain only information about the subdwarf primary and its orbit. From high resolution spectra the projected rotational velocity ...
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free text keywords: Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astronomy and Astrophysics, Stellar rotation, Astrophysics, Orbital elements, Binary number, White dwarf, Supernova, Astronomy, Physics, Stars, Subdwarf, Stellar classification
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