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The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX
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Blouin, Simon, Kilic, Mukremin, Bédard, Antoine and Tremblay, Pier-Emmanuel (2023) The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX. Monthly Notices of the Royal Astronomical Society: Letters, 525 (1). L112-L116. doi:10.1093/mnrasl/slad105 ISSN 1745-3933.
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Official URL: http://doi.org/10.1093/mnrasl/slad105
Abstract
The convective dredge-up of carbon from the interiors of hydrogen-deficient white dwarfs has long been invoked to explain the presence of carbon absorption features in the spectra of cool DQ stars ($T_{\rm eff} \lt 10\,000\,$K). It has been hypothesized that this transport process is not limited to DQ white dwarfs and also operates, albeit less efficiently, in non-DQ hydrogen-deficient white dwarfs within the same temperature range. This non-DQ population is predominantly composed of DC white dwarfs, which exhibit featureless optical spectra. However, no direct observational evidence of ubiquitous carbon pollution in DC stars has thus far been uncovered. In this Letter, we analyse data from the Galaxy Evolution Explorer to reveal the photometric signature of ultraviolet carbon lines in most DC white dwarfs in the $8500\, {\rm K} \le T_{\rm eff} \le 10\,500\,$K temperature range. Our results show that the vast majority of hydrogen-deficient white dwarfs experience carbon dredge-up at some point in their evolution.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | White dwarf stars | |||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society: Letters | |||||||||||||||||||||
Publisher: | Oxford University Press (OUP) | |||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||
Official Date: | October 2023 | |||||||||||||||||||||
Dates: |
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Volume: | 525 | |||||||||||||||||||||
Number: | 1 | |||||||||||||||||||||
Page Range: | L112-L116 | |||||||||||||||||||||
DOI: | 10.1093/mnrasl/slad105 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Re-use Statement: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Copyright Holders: | © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | |||||||||||||||||||||
Date of first compliant deposit: | 14 November 2023 | |||||||||||||||||||||
Date of first compliant Open Access: | 14 November 2023 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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