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The onset of convective coupling and freezing in the white dwarfs of 47 Tucanae
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Obertas, Alysa, Caiazzo, Ilaria, Heyl, Jeremy, Richer, Harvey, Kalirai, Jason and Tremblay, Pier-Emmanuel (2017) The onset of convective coupling and freezing in the white dwarfs of 47 Tucanae. Monthly Notices of the Royal Astronomical Society, 474 (1). pp. 677-682. doi:10.1093/mnras/stx2759
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WRAP-onset-onvective -coupling-White-Dwarfs-Tremblay-2017.pdf - Accepted Version - Requires a PDF viewer. Download (1317Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/stx2759
Abstract
Using images from the Hubble Space Telescope Advanced Camera for Surveys, we measure the rate of cooling of white dwarfs in the globular cluster 47 Tucanae and compare it to modelled cooling curves. We examine the effects of the outer convective envelope reaching the nearly isothermal degenerate core and the release of latent heat during core crystallization on the white dwarf cooling rates. For white dwarfs typical of 47 Tuc, the onset of these effects occur at similar times. The latent heat released during crystallization is a small heat source. In contrast, the heat reservoir of the degenerate core is substantially larger. When the convective envelope reaches the nearly isothermal interior of the white dwarf, the star becomes brighter than it would be in the absence of this effect. Our modelled cooling curves that include this convective coupling closely match the observed luminosity function of the white dwarfs in 47 Tuc.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of Science > Physics | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Stars -- Globular clusters | |||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
| Publisher: | Oxford University Press | |||||||||||||||
| ISSN: | 1745-3933 | |||||||||||||||
| Official Date: | 11 February 2017 | |||||||||||||||
| Dates: |
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| Volume: | 474 | |||||||||||||||
| Number: | 1 | |||||||||||||||
| Page Range: | pp. 677-682 | |||||||||||||||
| DOI: | 10.1093/mnras/stx2759 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Alysa Obertas, Ilaria Caiazzo, Jeremy Heyl, Harvey Richer, Jason Kalirai, Pier-Emmanuel Tremblay; The onset of convective coupling and freezing in the white dwarfs of 47 Tucanae, Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 1, 11 February 2018, Pages 677–682 online at:http://dx.doi.org/10.1093/mnras/stx2759 | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| RIOXX Funder/Project Grant: |
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