[vsnet-campaign-dn 3405] XZ Eri: superhump regrowth and period increase

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

XZ Eri: superhump regrowth and period increase

Dear Colleagues,

   We have received most up-to-date data from Berto Monard.  We have also
received runs (two+ nights) from Kiyota-san (Tsukuba), and the reduced
data at regular observatories (Kyoto, Torii-san at RIKEN, Tanabe-san at
Okayama) are steadily growing.

   The data now indicate a regrowth of the superhump amplitude.  However,
this regrowth is more related to the beat phonomenon, rather than a true
regrowth, which is expected to occur near the end of the superoutburst
plateau.

   The available data also suggest a period increase, at an approximate
rate of dot(P)/P = +5x10^(-5).  Up to now, XZ Eri shows all the unusual
features of the short-period SU UMa-type dwarf nova.  Please continue
the present coverage during the entire superoutburst (and expected
rebrightening).

Regards,
Taichi Kato
VSNET Collaboration team

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