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The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems

McAllister, M, Littlefair, SP, Parsons, SG, Dhillon, VS, Marsh, TR, Gänsicke, BT, Breedt, E, Copperwheat, CM, Green, MJ, Knigge, C, Sahman, DI, Dyer, MJ, Kerry, P, Ashley, RP, Irawati, P and Rattanasoon, S (2019) The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems. Monthly Notices of the Royal Astronomical Society, 486 (4). pp. 5535-5551. ISSN 0035-8711

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Abstract

We present measurements of the component masses in 15 Cataclysmic Variables (CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations of the relationship between superhump period excess and mass ratio, and use this relation to estimate donor star masses for 225 superhumping CVs. With an increased sample of donor masses we revisit the implications for CV evolution. We confirm the high mass of white dwarfs in CVs, but find no trend in white dwarf mass with orbital period. We argue for a revision in the location of the orbital periodminimum of CVs to 79.6±0.2min, significantly shorter than previous estimates. We find that CV donors below the gap have an intrinsic scatter of only 0.005 R⊙ around a common evolutionary track, implying a correspondingly small variation in angular momentum loss (AML) rates. In contrast to prior studies, we find that standard CV evolutionary tracks - without additional AML - are a reasonable fit to the donor masses just below the period gap, but that they do not reproduce the observed period minimum, or fit the donor radii below 0.1M⊙. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 16 Jul 2019 10:11
Last Modified: 16 Jul 2019 10:15
DOI or Identification number: 10.1093/mnras/stz976
URI: http://researchonline.ljmu.ac.uk/id/eprint/11041

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