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System parameters of three short period cataclysmic variable stars
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Wild, J. F., Littlefair, S. P., Ashley, R. P., Breedt, E., Brown, A. J., Dhillon, V. S., Dyer, M. J., Green, M. J., Kerry, P., Marsh, T. R., Parsons, S. G. and Sahman, D. I. (2022) System parameters of three short period cataclysmic variable stars. Monthly Notices of the Royal Astronomical Society, 509 (4). pp. 5086-5101. doi:10.1093/mnras/stab3260 ISSN 1365-2966.
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WRAP-system-parameters-three-short-period-cataclysmic-variable-stars-2022.pdf - Published Version - Requires a PDF viewer. Download (6Mb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stab3260
Abstract
Using photometric ULTRACAM observations of three new short period cataclysmic variables, we model the primary eclipse lightcurves to extract the orbital separation, masses, and radii of their component stars. We find donor masses of 0.060 ± 0.008 M⊙, 0.042 ± 0.001 M⊙, and 0.042 ± 0.004 M⊙, two being very low-mass sub-stellar donors, and one within 2σ of the hydrogen burning limit. All three of the new systems lie close to the empirical evolutionary sequence that has emerged from observations of the last decade. We briefly re-evaluate the long-standing discrepancy between observed donor mass and radius data, and theoretical CV evolutionary tracks. By looking at the difference in the observed period at each mass and the period predicted by the modelled evolutionary sequences, we qualitatively examine the form of excess angular momentum loss that is missing from the models below the period gap. We show indications that the excess angular momentum loss missing from CV models grows in importance relative to gravitational losses as the period decreases. Detailed CV evolutionary models are necessary to draw more quantitative conclusions in the future.
| 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): | Cataclysmic variable stars, Eclipsing binaries, White dwarf stars, Astronomical photometry | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||
| ISSN: | 1365-2966 | |||||||||
| Official Date: | February 2022 | |||||||||
| Dates: |
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| Volume: | 509 | |||||||||
| Number: | 4 | |||||||||
| Page Range: | pp. 5086-5101 | |||||||||
| DOI: | 10.1093/mnras/stab3260 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved. | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Date of first compliant deposit: | 10 June 2022 | |||||||||
| Date of first compliant Open Access: | 10 June 2022 | |||||||||
| RIOXX Funder/Project Grant: |
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