Retter, A and Hellier, C (1999) A 6.4-hr positive superhump period in TV Col. arXiv.org.

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Abstract

Re-examination of photometric data of TV Col (Hellier, 1993) reveals positive superhumps in addition to the negative superhumps previously known. The superhump period is 0.265+/-0.005 day - about 16 percent longer than the orbital period - which obeys the relation between superhump-period excess and orbital period (Stolz and Schoembs 1984). As a confirmed permanent superhumper, the accretion disc of TV Col is naturally thermally stable. Therefore, our result supports the idea of Hellier and Buckley (1993) that the short-term outbursts seen in its light curve are mass transfer events rather than thermal instabilities in the disc. At 5.5-hr, TV Col has a longer orbital period than any known superhumper, and thus a mass ratio which is probably outside the range at which superhumps can occur according to current theory.

Item Type: Article
Uncontrolled Keywords: accretion, accretion discs, stars: individuals: TV Col novae, cataclysmic variables
Subjects: Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 11 Mar 2015 14:22
Last Modified: 25 May 2016 08:55
URI: http://eprints.keele.ac.uk/id/eprint/318

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