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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2(518), p. 3055-3073, 2022

DOI: 10.1093/mnras/stac3303

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Gaia white dwarfs within 40 pc – III. Spectroscopic observations of new candidates in the Southern hemisphere

Journal article published in 2022 by Mairi W. O’Brien ORCID, P.-E. Tremblay, N. P. Gentile Fusillo, M. A. Hollands ORCID, B. T. Gänsicke ORCID, D. Koester ORCID, I. Pelisoli ORCID, E. Cukanovaite ORCID, T. Cunningham ORCID, A. E. Doyle, A. Elms ORCID, J. Farihi ORCID, J. J. Hermes ORCID, J. Holberg, S. Jordan ORCID and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Abstract We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the Southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical Research Telescope. Almost all candidates were selected from Gaia Data Release 3 (DR3). We find a total of 246 confirmed white dwarfs, 209 of which had no previously published spectra, and two main-sequence star contaminants. Of these, 100 white dwarfs display hydrogen Balmer lines, 69 have featureless spectra, and two show only neutral helium lines. Additionally, 14 white dwarfs display traces of carbon, while 37 have traces of other elements that are heavier than helium. We observe 35 magnetic white dwarfs through the detection of Zeeman splitting of their hydrogen Balmer or metal spectral lines. High spectroscopic completeness (> 97 per cent) has now been reached, such that we have 1058 confirmed Gaia DR3 white dwarfs out of 1083 candidates within 40 pc of the Sun at all declinations.