SIMBAD references

1999PASP..111.1275F - Publ. Astron. Soc. Pac., 111, 1275-1280 (1999/October-0)

Superhumps in cataclysmic binaries. XVI. DI Ursae Majoris.

FRIED R.E., KEMP J., PATTERSON J., SKILLMAN D.R., RETTER A., LEIBOWITZ E. and PAVLENKO E.

Abstract (from CDS):

We report photometry of the dwarf nova DI Ursae Majoris during 1997-1998. The star shows an orbital light curve at quiescence with a period of 0.054564(1) days. During superoutburst, it flashes superhumps with a period of 0.05529(5) days. The superhump period excess of 1.3% is quite low among cataclysmic variables, suggesting a weak perturbation on the accretion disk and therefore a secondary of very low mass. But other stars of low period excess are rare eruptors, whereas DI UMa is extremely active with normal outbursts every 8 days and superoutbursts every 30-45 days. This is puzzling. We speculate that the binary really does have a secondary of anomalously low mass but is presently in a high state of a mass-transfer cycle.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Novae, Cataclysmic Variables - stars: individual (DI Ursae Majoris)

Simbad objects: 5

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2020.10.31-02:31:03

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