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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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Official URL: http://dx.doi.org/10.1093/mnras/stx2759

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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
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:
DateEvent
11 February 2017Published
24 October 2017Available
19 October 2017Accepted
Date of first compliant deposit: 18 January 2019
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:
Project/Grant IDRIOXX Funder NameFunder ID
NAS5-26555[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
UNSPECIFIED[NSERC] Natural Sciences and Engineering Research Council of Canadahttp://dx.doi.org/10.13039/501100000038
UNSPECIFIEDCanadian Foundation for InnovationUNSPECIFIED
UNSPECIFIEDBritish Columbia Knowledge Development Fundhttp://dx.doi.org/10.13039/501100007711

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