[vsnet-alert 12214] (fwd) OT J071948.9+405332 is likely a CV

[Taichi Kato]

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ATEL #2883							     ATEL #2883

Title:		OT 071948.9+405332 is a Cataclysmic Variable in outburst 
Author:	D. Denisenko (IKI, Moscow) 
Queries:	denis at hea.iki.rssi.ru
Posted:	29 Sep 2010;  13:24  UT
Subjects:	Optical, Cataclysmic Variables, Transients

We have checked the available archival images of the optical transient
in Auriga OT 071948.9+405332 reported in ATel #2878 by MASTER team (Shumkov
et al.) and have identified it with the faint blue star SDSS J071948.92+405331.8
(u=21.64, g=21.83, r=21.51, i=21.53, z=21.98) which is also visible on
Blue Palomar plate taken on 1997 Apr. 08.  The outburst amplitude (about
5m) and fast raise reported in ATel 2878 (by more than 1m in 5 hours) strongly
suggest the dwarf nova outburst caught on the early stage.  SDSS colors
are also consistent with the cataclysmic variable in quiescence.   

The finder charts of the new variable (color-combined DSS and SDSS)
with the position of OT marked with dashes are available at http://hea.iki.rssi.ru/~denis/J0719+4053-finders.jpg

The photometric time series are desirable to search for possible superhumps,
to measure the period and to determine the variability subtype.