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Binary evolution pathways of blue large-amplitude pulsators
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Byrne, C. M, Stanway, Elizabeth R. and Eldridge, J. J. (2021) Binary evolution pathways of blue large-amplitude pulsators. Monthly Notices of the Royal Astronomical Society, 507 (1). pp. 623-631. doi:10.1093/mnras/stab2115 ISSN 1745-3933.
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WRAP-binary-evolution-pathways-Blue-Large-Amplitude-Pulsators-Byrne-2021.pdf - Accepted Version - Requires a PDF viewer. Download (7Mb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/stab2115
Abstract
Blue Large-Amplitude Pulsators (BLAPs) are a recently discovered class of pulsating star, believed to be proto-white dwarfs, produced by mass stripping of a red giant when it has a small helium core. An outstanding question is why the stars in this class of pulsator seem to form two distinct groups by surface gravity, despite predictions that stars in the gap between them should also pulsate. We use a binary population synthesis model to identify potential evolutionary pathways that a star can take to become a BLAP. We find that BLAPs can be produced either through common envelope evolution or Roche lobe overflow, with a Main Sequence star or an evolved compact object being responsible for the envelope stripping. The mass distribution of the inferred population indicates that fewer stars would be expected in the range of masses intermediate to the two known groups of pulsators, suggesting that the lack of observational discoveries in this region may be a result of the underlying population of pre-white dwarf stars. We also consider metallicity variation and find evidence that BLAPs at Z = 0.010 (half-Solar) would be pulsationally unstable and may also be more common. Based on this analysis, we expect the Milky Way to host around 12000 BLAPs and we predict the number density of sources expected in future observations such as the Legacy Survey of Space and Time at the Vera Rubin Observatory.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | White dwarf stars, Pulsating stars, Stellar oscillations, Double stars | |||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
Publisher: | Oxford University Press | |||||||||
ISSN: | 1745-3933 | |||||||||
Official Date: | October 2021 | |||||||||
Dates: |
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Volume: | 507 | |||||||||
Number: | 1 | |||||||||
Page Range: | pp. 623-631 | |||||||||
DOI: | 10.1093/mnras/stab2115 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record C M Byrne, E R Stanway, J J Eldridge, Binary evolution pathways of Blue Large-Amplitude Pulsators, Monthly Notices of the Royal Astronomical Society, 2021;, stab2115, is available online at: https://doi.org/10.1093/mnras/stab2115 | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 2 August 2021 | |||||||||
Date of first compliant Open Access: | 3 August 2021 | |||||||||
RIOXX Funder/Project Grant: |
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