Detail publikace

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. II: The Second Year (2009-2010)

Kato, T et al.

Originální název

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. II: The Second Year (2009-2010)

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Continued from Kato et al. (2009, PASJ, 61, S395), we collected the times of superhump maxima for 68 SU UMa-type dwarf novae, mainly observed during the 2009-2010 season. The newly obtained data confirmed the basic findings reported in Kato et al. (ibid.): the presence of stages A-C and the predominance of positive period derivatives during stage B in systems with superhump periods shorter than 0.07 d. There was a systematic difference in the period derivatives for the systems with superhump periods longer than 0.075 d between this study and Kato et al. (ibid.). We suggest that this difference was possibly caused by a relative lack of frequently outbursting SU UMa-type dwarf novae in this period regime in the present study. We recorded a strong beat phenomenon during the 2009 superoutburst of IY UMa. A close correlation between the beat period and the superhump period suggests that the changing angular velocity of the apsidal motion of the elliptical disk is responsible for the variation of the superhump periods. We also described three new WZ Sge-type objects with established early superhumps and one with likely early superhumps. We suggest that two systems, VX For and EL UMa, are WZ Sge-type dwarf novae with multiple rebrightenings. The O - C variation in OT J213806.6+261957 suggests that the frequent absence of rebrightenings in very short-P-orb objects can be the result of a sustained superoutburst plateau at the epoch when usual SU UMa-type dwarf novae return to quiescence, preceding a rebrightening. We also present a formulation for a variety of Bayesian extensions to traditional period analyses.

Klíčová slova

accretion, accretion disks; stars: dwarf novae; stars: novae, cataclysmic variables

Autoři

Kato, T; et al.

Rok RIV

2010

Vydáno

25. 12. 2010

Nakladatel

C/O NATIONAL ASTRONOMICAL OBSERVATORY, 2-21-1 OSAWA, MITAKA-SHI, TOKYO, 181-8588, JAPAN

Místo

Tokyo

ISSN

0004-6264

Periodikum

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN

Ročník

62

Číslo

6

Stát

Japonsko

Strany od

1525

Strany do

1584

Strany počet

60

BibTex

@article{BUT49888,
  author="Kato, T and et al.",
  title="Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. II: The Second Year (2009-2010)",
  journal="PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN",
  year="2010",
  volume="62",
  number="6",
  pages="1525--1584",
  issn="0004-6264"
}