Open AccessLate superhumps and the stream–disc impact in IY UMa
Author(s) -
Rolfe Daniel J.,
Haswell Carole A.,
Patterson Joseph
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04248.x
Subject(s) - physics , astronomy , accretion disc , accretion (finance) , astrophysics
We use the hotspot eclipse times of the newly discovered deeply eclipsing dwarf nova IY UMa to trace out the shape of its disc during the late superhump era. We find an eccentric disc. We show that the brightness of the stream–disc impact region varies as expected with |Δ V | 2 , where Δ V is the relative velocity of the stream with respect to the velocity of the disc at the impact point. We conclude that the hotspot is the source of late superhump light.