[vsnet-alert 7325] IY UMa outburst (most likely superoutburst)!

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

IY UMa outburst (most likely superoutburst)!

   As reported by Pavol A. Dubovsky, the deeply eclipsing SU UMa-type
dwarf nova IY UMa (TmzV85) is undergoing an outburst.  The outburst has
been expected by the VSNET Collaboration team, and we have already received
and obtained most important pre-superoutburst observations.

   Please continue your observations to completely follow (first time
in the history) of this very favorably situated (presumable) superoutburst!

   In addition to usual time-series photometry covering all phases and
eclipses, we encourage time-resolved spectroscopy, since IY UMa is known
to show prominent emission lines even during outbursts.  Velocity mapping
using eclipses, as well as an attempt to detect spiral patterns would be
most vaulable.

   Please report your observations to vsnet-campaig-dn (when you send raw
data, please send them to Uemura-san and Ishioka-san,
uemura@kusastro.kyoto-u.ac.jp and ishioka@kusastro.kyoto-u.ac.jp)
in order to avoid any delay.

   For a reference, the following VSNET page would be useful

   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/tmzv85.html

References:

Uemura et al. (2000) PASJ 52, L9 : discovery of a deeply eclipsing SU UMa-type
                                   dwarf nova
Uemura et al. (2000) IAUC 7349
Patterson et al. (2000) PASP 112, 1567 : binary parameters and superhumps
Rolfe et al. (2001) MNRAS 324, 529 : late superhumps
Rolfe et al. (2001) in "Astrotomography, Indirect Imaging Methods in
             Observational Astronomy" p.39 : Doppler tomography
Wu et al. (2001) ApJ 549, L81 : prominent emission lines in outburst
Kato et al. (2001) IBVS 5159 : supercycle

   Please enjoy the current event!

Regards,
Taichi Kato
VSNET Collaboration team

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