Discovery of a Peculiar SU UMa-Type Dwarf Nova ER Ursae Majoris

Details Discovery of a Peculiar SU UMa-Type Dwarf Nova ER Ursae Majoris Discovery of a Peculiar SU UMa-Type Dwarf Nova ER Ursae Majoris

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..163k&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.163-168.

Astronomy and Astrophysics

Astronomy

57

Accretion Disks, Stars: Cataclysmic, Stars: Dwarf Novae, Stars: Individual (Er Uma)

Scientific paper

An ultraviolet excess object, ER Ursae Majoris (=PG 0943+521), was confirmed to be an SU UMa-type dwarf nova with a superhump period of 0.06549--0.06573 day. This dwarf nova shows a most unusual outburst light curve: superoutbursts occurring every only 43 d and lasting about 20 d, normal outbursts occurring every four days, and a full outburst amplitude of only 3.0 mag. The authors suggest that such an exceptional behavior may be the consequence of an extremely large mass-transfer rate of this system. The implications of this discovery on the origin of mass-transfer in cataclysmic variables and the disk-instability theory are briefly discussed.

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