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An independent test of the photometric selection of white dwarf candidates using LAMOST DR3
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Gentile Fusillo, N. P., Rebassa-Mansergas, A., Gänsicke, B. T. (Boris T.), Liu, X.-W., Ren, J. J., Koester, Detlev, Zhan, Y., Hou, Y., Wang, Y. and Yang, M. (2015) An independent test of the photometric selection of white dwarf candidates using LAMOST DR3. Monthly Notices of the Royal Astronomical Society, 452 (1). pp. 765-773. doi:10.1093/mnras/stv1338 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stv1338
Abstract
In previous work by Gentile Fusillo et al., we developed a selection method for white dwarf candidates which makes use of photometry, colours and proper motions to calculate a probability of being a white dwarf (PWD). The application of our method to the Sloan Digital Sky Survey (SDSS) data release 10 resulted in ≃66 000 photometrically selected objects with a derived PWD, approximately ≃21 000 of which are high-confidence white dwarf candidates. Here, we present an independent test of our selection method based on a sample of spectroscopically confirmed white dwarfs from the Large Sky Area Multi-Fiber Spectroscopic Telescope (LAMOST) survey. We do this by cross-matching all our ≃66 000 SDSS photometric white dwarf candidates with the over 4 million spectra available in the third data release of LAMOST. This results in 1673 white dwarf candidates with no previous SDSS spectroscopy, but with available LAMOST spectra. Among these objects, we identify 309 genuine white dwarfs. We find that our PWD can efficiently discriminate between confirmed LAMOST white dwarfs and contaminants. Our white dwarf candidate selection method can be applied to any multiband photometric survey and in this work we conclusively confirm its reliability in selecting white dwarfs without recourse to spectroscopy. We also discuss the spectroscopic completeness of white dwarfs in LAMOST, as well as deriving effective temperatures, surface gravities and masses for the hydrogen-rich atmosphere white dwarfs in the newly identified LAMOST sample.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||
| Publisher: | Oxford University Press | ||||||
| ISSN: | 0035-8711 | ||||||
| Official Date: | 1 September 2015 | ||||||
| Dates: |
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| Volume: | 452 | ||||||
| Number: | 1 | ||||||
| Page Range: | pp. 765-773 | ||||||
| DOI: | 10.1093/mnras/stv1338 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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