[vsnet-alert 14877] Re: New Bright CV in Hercules by MASTER

[Gianluca Masi]

Dear Colleagues,

we started time resolved photometry on this OT about 3 hours
ago, remotely using the 14" unit part of the Virtual
Telescope robotic facility, in Italy.

The transient is at mag 14.2 (unfiltered) and seems to fade,
with small amplitude modulation superimposed to this trend.
No obvious signs of large superhumps.

Observations are still running.

Regards
Gianluca Masi
Francesca Nocentini


----- Original Message -----
Da : Denis Denisenko <d.v.denisenko at gmail.com>
A : vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Oggetto : [vsnet-alert 14875] New Bright CV in Hercules by
MASTER
Data : Tue, 21 Aug 2012 19:48:28 +0400

> Dear all,
> 
> I have discovered yet another bright dwarf nova in
> Hercules from MASTER-Amur images with two previous
> outbursts in NEAT data. The discovery was just announced
> by MASTER Team in ATel 4324 (D. Denisenko, V. Lipunov, N.
> Tiurina et al.), see
> <http://www.astronomerstelegram.org/?read=4324>. Outburst
> is "hot", the latest image with the star in quiescence was
> obtained just 2 days ago, on Aug. 19. Outburst amplitude
> is about 5m, so this one may be a new SU UMa-type
> variable. Photometry is encouraged!
> 
> I am forwarding the text of the Telegram below.
> 
> Denis Denisenko
> 
> ===============================
> The Astronomer's Telegram #4324
> ===============================
> Posted on 21 Aug 2012; 15:24 UT
> 
> ----------------------------------------------
> New Bright CV in Hercules discovered by MASTER
> ----------------------------------------------
> 
> MASTER OT J174902.10+191331.2 - new bright CV
> 
> MASTER-Amur auto-detection system discovered OT source at
> (RA, Dec) = 17h 49m 02.10s +19d 13m 31.2s on
> 2012-08-21.51684 UT. The OT unfiltered magnitude is 13.3m
> (limit 17.4m). The OT is also seen in 2 images taken on
> 2012-08-20.542 and 20.573 UT with the same unfiltered
> magnitude 13.3. Nothing was visible at this position on
> the unfiltered image of 2012-08-19.521 UT to the limiting
> magnitude 17.5m.
> 
> The discovery and reference images are available at:
> http://master.sai.msu.ru/static/OT/J17490210+1913312.jpg
> 
> There is nothing at this position in 2MASS, GCVS and AAVSO
> VSX. This area is not covered by GALEX, SDSS and CRTS.
> 
> There is a star in USNO-B1.0 catalog within 2" of the OT
> named USNO-B1.0 1092-0283596 with the following
> coordinates, proper motions and magnitudes:
> 17 49 02.087 +19 13 29.52 pmRA=0 pmDE=0 B1=20.29 R1=18.64
> B2=20.06 R2=17.79 I=18.64
> 
> This area was observed by the NEAT project on 12 nights
> from 1998 June 24 to 2005 Aug. 30. In total 36 images were
> taken. The object was in outburst on 2003 Aug. 07 and then
> again on 2005 Aug. 13 and 30, but at quiescence on all
> other images.
> 
> Based on the amplitude of variability, short rise time and
> presence of previous outbursts we conclude that MASTER OT
> J174902.10+191331.2 is a new cataclysmic variable (dwarf
> nova). Follow up observations are encouraged.
> 
> 10'x10' color-combined (BRIR) DSS finder chart is uploaded
> to
>
http://master.sai.msu.ru/static/OT/J1749+1913-BRIR10x10.jpg