Rebassa-Mansergas, A.; Ren, J. J.; Irawati, P.; García-Berro, E.; Parsons, S. G.; Schreiber, M. R.; Gänsicke, B. T.; Rodríguez-Gil, P.; Liu, X.; Manser, C.; Nevado, S. P.; Jiménez-Ibarra, F.; Costero, R.; Echevarría, J.; Michel, R.; Zorotovic, M.; Hollands, M.; Han, Z.; Luo, A.; Villaver, E.; Kong, X.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 4, p.4193-4203
Description
We present the second paper of a series of publications aiming at
obtaining a better understanding regarding the nature of type Ia
supernovae (SN Ia) progenitors by studying a large sample of detached F,
G and K main-sequence stars in close orbits with white dwarf companions
(i.e. WD+FGK binaries). We employ the Large Sky Area Multi-Object Fibre
Spectroscopic Telescope (LAMOST) data release 4 spectroscopic data base
together with Galaxy Evolution Explorer (GALEX) ultraviolet fluxes to
identify 1549 WD+FGK binary candidates (1057 of which are new), thus
doubling the number of known sources. We measure the radial velocities
of 1453 of these binaries from the available LAMOST spectra and/or from
spectra obtained by us at a wide variety of different telescopes around
the globe. The analysis of the radial velocity data allows us to
identify 24 systems displaying more than 3σ radial velocity
variation that we classify as close binaries. We also discuss the
fraction of close binaries among WD+FGK systems, which we find to be
˜10 per cent, and demonstrate that high-resolution spectroscopy is
required to efficiently identify double-degenerate SN Ia progenitor
candidates.
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The study of binary stars is essential to stellar astrophysics. A large number of stars form and evolve within binary systems. Therefore, their study is fundamental to understand stellar and galactic evolution. Particularly relevant is that binary systems are still the best source of precise stellar mass and radius measurements. Research lines
Black holes, neutron stars, white dwarfs and their local environment
Accreting black-holes and neutron stars in X-ray binaries provide an ideal laboratory for exploring the physics of compact objects, yielding not only confirmation of the existence of stellar mass black holes via dynamical mass measurements, but also the best opportunity for probing high-gravity environments and the physics of accretion; the most
