Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Gaensicke, B. T. (Boris T.) and Copperwheat, C. M. (2008) On the evolutionary status of short period cataclysmic variables. In: High Time Resolution Astrophysics : The Universe at Sub-Second Timescales. Published in: AIP Conference Proceedings, Vol.984 pp. 23-31.

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Abstract

We present system parameters for a small sample of short period, eclipsing CVs taken from the Sloan Digital Sky Survey. Three out of seven of the systems possess brown dwarf donor stars and have thus evolved past the orbital period minimum. This is broadly consistent with predictions that 40–70 per cent of CVs should have evolved past the orbital period minimum. The donor star masses themselves are inconsistent with model predictions, unless enhanced angular momentum loss (e.g. from circumbinary discs) is invoked. However, the mass transfer rates as deduced from white dwarf effective temperatures are not consistent with enhanced mass transfer rates. Solution of this conundrum will require independent estimates of the mass transfer rates in short period CVs. The white dwarfs show a strong tendency towards high masses. This may in part be due to selection effects. There is one Iron core white dwarf, and no Helium core white dwarfs in our sample, despite predictions that 30–80 per cent of short period CVs should contain Helium core white dwarfs. ©2008 American Institute of Physics

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	White dwarf stars, Accretion (Astrophysics), Cataclysmic variable stars, Mass transfer, Double stars, Eclipsing binaries, Dwarf novae
Journal or Publication Title:	AIP Conference Proceedings
Publisher:	American Institute of Physics
ISSN:	0094-243X
Book Title:	AIP Conference Proceedings
Official Date:	2008
Dates:	Date Event 2008 Published
Volume:	Vol.984
Page Range:	pp. 23-31
Identification Number:	10.1063/1.2896935
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Version or Related Resource:	Littlefair, S. P., et al. (2008). On the evolutionary status of short-period cataclysmic variables. Monthly Notices of the Royal Astronomical Society, 388(4), pp. 1582-1594.
Conference Paper Type:	Paper
Title of Event:	High Time Resolution Astrophysics : The Universe at Sub-Second Timescales
Type of Event:	Conference
Related URLs:	Publisher Related item in WRAP
URI:	http://wrap.warwick.ac.uk/id/eprint/39784

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