[vsnet-alert 9546] WZ Sge-type HS2331+3905 bright outburst: spectrum remarkably similar to WZ Sge 2001

[Taichi Kato]

   Fujii-san has provided the following spectrum on Sep 5.51 UT.

http://www1.harenet.ne.jp/~aikow/etc/hs2331+3905_20070905.gif

  The Balmer series are in strong emission (FWHM of Halpha 1900 km/s,
EW = -65A), and He II (notably very strong 4686!, 4199, 4542, 5412).
The spectrum also shows the presence of a highly excited lines of
CIV/NIV around 5790, and possibly NaD (or HeI) absorption.
These features are remarkably similar to WZ Sge during the 2001
superoutburst (Nogami and Iijima, PASJ 56, S163; available at
http://pasj.asj.or.jp/v56/sp1/56s115/56s115-frame.html
http://arxiv.org/abs/astro-ph/0401292 ).

  Continued time-resolved spectroscopy are also highly encouraged
to detect the velocity field of the spiral structure (as well as
the emission from the secondary).