Informace o publikaci
Superoutburst of CR Bootis: Estimation of mass ratio of a typical AM CVn star by stage A superhumps
Autoři | |
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Rok publikování | 2016 |
Druh | Článek v odborném periodiku |
Časopis / Zdroj | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN |
Fakulta / Pracoviště MU | |
Citace | |
www | https://academic.oup.com/pasj/article-abstract/68/4/64/2223334/Superoutburst-of-CR-Bootis-Estimation-of-mass?redirectedFrom=fulltext |
Doi | http://dx.doi.org/10.1093/pasj/psw063 |
Obor | Astronomie a nebeská mechanika, astrofyzika |
Klíčová slova | accretion; accretion disks; novae; cataclysmic variables; stars; dwarf novae; stars; individual (CR Bootis) |
Popis | We report on two superoutbursts of the AM CVn-type object CR Boo in 2014 April-March and 2015 May-June. A precursor outburst accompanied both of these superoutbursts. During the rising branch of the main superoutburst in 2014, we detected growing super-humps (stage A superhumps) whose period was 0.017669(24) d. Assuming that this period reflects the dynamical precession rate at the radius of the 3: 1 resonance, we could estimate the mass ratio (q = M-2/M-1) of 0.101(4) by using the stage A superhump period and the orbital period of 0.0170290(6) d. This mass ratio is consistent with that expected from the theoretical evolutionary model of AM CVn-type objects. The detection of precursor outbursts and stage A superhumps is the second case in AM CVn-type objects. There are two interpretations of the outbursts of AM CVn-type objects. One is a dwarf nova (DN) outbursts analogy, which suggets that the outbursts are caused by thermal and tidal instabilities. Another is the VY Scl-type variation, which suggests that the outbursts are caused by the variation of the mass-transfer rate of the secondary. This detection of the superhump variations strongly supports the former interpretation. |