The evolutionary status of cataclysmic variables: Eclipse modelling of 15 systems
The evolutionary status of cataclysmic variables: Eclipse modelling of 15 systems
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 period minimum 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⊙.
Binaries: close, Binaries: eclipsing, Novae, cataclysmic variables, Stars: dwarf novae, Stars: evolution, White dwarfs
5535-5551
McAllister, M.
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Littlefair, S. P.
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Parsons, S. G.
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Dhillon, V. S.
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Marsh, T. R.
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Gänsicke, B. T.
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Breedt, E.
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Copperwheat, C.
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Green, M. J.
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Knigge, C.
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Sahman, D. I.
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Dyer, Martin J.
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Kerry, P.
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Ashley, R. P.
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Irawati, P.
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Rattanasoon, S.
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July 2019
McAllister, M.
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Littlefair, S. P.
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Parsons, S. G.
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Dhillon, V. S.
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Marsh, T. R.
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Gänsicke, B. T.
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Breedt, E.
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Copperwheat, C.
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Green, M. J.
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Knigge, C.
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Sahman, D. I.
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Dyer, Martin J.
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Kerry, P.
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Ashley, R. P.
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Irawati, P.
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Rattanasoon, S.
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McAllister, M., Littlefair, S. P., Parsons, S. G., Dhillon, V. S., Marsh, T. R., Gänsicke, B. T., Breedt, E., Copperwheat, C., Green, M. J., Knigge, C., Sahman, D. I., Dyer, Martin J., Kerry, P., Ashley, R. P., 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), .
(doi:10.1093/mnras/stz976).
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 period minimum 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⊙.
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stz976
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More information
Accepted/In Press date: 1 April 2019
e-pub ahead of print date: 24 April 2019
Published date: July 2019
Additional Information:
This article has been accepted for publication in Monthly Notices of Royal Astronomical Society ©: 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords:
Binaries: close, Binaries: eclipsing, Novae, cataclysmic variables, Stars: dwarf novae, Stars: evolution, White dwarfs
Identifiers
Local EPrints ID: 432543
URI: http://eprints.soton.ac.uk/id/eprint/432543
ISSN: 1365-2966
PURE UUID: 405d1b35-ec70-4213-85c8-e50b4eaf4a68
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Date deposited: 17 Jul 2019 16:31
Last modified: 17 Mar 2024 12:30
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Contributors
Author:
M. McAllister
Author:
S. P. Littlefair
Author:
S. G. Parsons
Author:
V. S. Dhillon
Author:
T. R. Marsh
Author:
B. T. Gänsicke
Author:
E. Breedt
Author:
C. Copperwheat
Author:
M. J. Green
Author:
D. I. Sahman
Author:
Martin J. Dyer
Author:
P. Kerry
Author:
R. P. Ashley
Author:
P. Irawati
Author:
S. Rattanasoon
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