[vsnet-alert 16286] Re: ASASSN-13cg

[Denis Denisenko]

Outburst has started on Aug. 23, as shown by MASTER observations
(unfiltered magnitudes calibrated against 0.2*B+0.8*R from USNO-B1.0):

ASASSN-13cg
  20130823.873  13.09C  MASTER-Kislovodsk
  20130823.879  13.16C  MASTER-Kislovodsk
  20130823.880  13.21C  MASTER-Kislovodsk
  20130823.881  13.26C  MASTER-Kislovodsk
  20130824.718  13.53C  MASTER-Kislovodsk

Object has many IDs in various catalogs:
SDSS J205252.73-023952.9 u=18.15 g=18.34 r=18.25 i=18.36 z=18.36
GALEX J205252.7-023953 FUV=18.48+/-0.10 NUV=18.47+/-0.03
USNO-B1.0 0873-0753320 20 52 52.728 -02 39 52.67 pmRA=26 pmDE=-10 B1=18.01
R1=17.65 B2=18.66 R2=18.63 I=18.49
USNO-A2.0 0825-18802572 20 52 52.66 -02 39 51.8 R=17.6 B=17.6

No previous outbursts were detected on 83 NEAT images obtained on 30
different nights from 1997 Aug. 02 to 2005 Aug. 21, as well as on 12 DSS
plates from 1953 to 1999. Object seems to be an AM CVn-type dwarf nova,
indeed!

Denis Denisenko
Member of MASTER team at SAI MSU

On Wed, Aug 28, 2013 at 4:27 AM, Taichi Kato
<tkato at kusastro.kyoto-u.ac.jp>wrote:

> ASASSN-13cg
>
>    No outburst was recorded in CRTS.
>    The SDSS object is indeed blue (no hint of the secondary
> contribution) and u-g = -0.2.
>    The object naturally deserves further observation
> (time-resolved photometry and spectroscopy), since it may be
> an AM CVn-type or an EI Psc-like object.
>