中国迷信院机构常识库网格系统: The white dwarf

  Garcia-Berro, E.4,12; Rebassa-Mansergas, A.(Univ Politecn Cataluna, Dept Fis, C Esteve Terrades 5, E-08860 Castelldefels, Spain); Kong, X.3; Villaver, E.10; Luo, A.3; Han ZW(韩占文)6; Hollands, M.8; Zorotovic, M.7; Michel, R.2; Echevarria, J.14

  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

  2017-12-01

  47244193-42030035-8711

  Stars: Low-mass

  White Dwarfs

  Binaries (Including Multiple): Close

  10.1093/mnras/stx2259

  第13完成单位

  Article

  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 3s 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 similar to 10 per cent, and demonstrate that high-resolution spectroscopy is required to efficiently identify double-degenerate SN Ia progenitor candidates.

  天文学

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  COMMON-ENVELOPE BINARIES

  ; DELAY-TIME DISTRIBUTION

  ; CORE-DEGENERATE SCENARIO

  ; MAIN-SEQUENCE BINARIES

  ; NEBULA HENIZE 2-428

  ; IA SUPERNOVAE

  ; CATACLYSMIC VARIABLES

  ; OBSERVATIONAL EVIDENCE

  ; ABSOLUTE MAGNITUDES

  ; ORBITAL PERIOD

  Astronomy & Astrophysics

  英语

  WOS:000415652500033

  Agencia de Gestio d'Ajuts Universitaris i de Recerca

  ; Agencia de Gestio d'Ajuts Universitaris i de Recerca(AYA2014-59084-P, AYA2014-55840-P)

  ; Young Researcher Grant of National Astronomical Observatories, Chinese Academy of Sciences

  ; Key Basic Research Program of China(2014CB845700)

  ; Leverhulme Trust

  ; European Research Council under the European Union's Seventh Framework Programme (FP)/ERC grant(320964)

  ; Fondecyt(1141269)

  ; National Development and Reform Commission

  ; Palomar Hale Telescope (through Chinese Telescope Access Program)(2013B-20)