Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56s.141u&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.56, No.SP1, pp. S141-S146
Astronomy and Astrophysics
Astronomy
14
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual (Xz Eri)
Scientific paper
We discovered superhumps in an eclipsing dwarf nova, XZ Eridani, during an outburst in 2003 January-February. We determined the orbital and average superhump periods to be 0.061159602 ± 0.000000044 d and 0.062808 ± 0.000017 d, respectively. Our observations thus established that XZ Eri belongs to a rare class of deeply eclipsing SU UMa-type dwarf novae. The object has the shortest orbital period among seven known objects in this class. The superhump period decreased with time during a mid-plateau phase of the superoutburst, as observed in a number of ordinary, long-period SU UMa stars. During an early phase of the superoutburst, however, the superhump period increased, as observed in several short-period systems. XZ Eri is a unique object with which we can study the evolution of accretion-disk structures through eclipses during the phase of the superhump period increase.
Bolt G. G.
Cook Lewis M.
Ishioka Ryoko
Kato Taichi
Kiyota Seiichiro
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