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Two new CVs detected by MASTER

ATel #4508; V. Echeistov, P. Balanutsa, D. Denisenko, P. Podvorotny, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 22 Oct 2012; 11:08 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Ultra-Violet, Cataclysmic Variable

MASTER OT J231917.03+483114.2 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 23h 19m 17.03s +48d 31m 14.2s on 2012-10-12.58108 UT. The OT unfiltered magnitude is 16.3m (limit 18.3m). The OT is seen in 1 image. We have reference image without OT on 2011-12-26.41296 UT with magnitude limit in 'V' filter 18.1m.

There is a blue star at the position of the OT on POSS-II plates. It was faint (mag ~21) on 1989 July 12 blue plate, but in outburst on 1989 Aug. 28. It is present in GSC 2.3.2 with coordinates 23 19 17.068 +48 31 14.16 and Jmag=16.95. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J231917+483114-BRIR.jpg (10'x10' FOV) with comparison of 1989-07-12 and 1989-08-28 blue images at http://master.sai.msu.ru/static/OT/J231917+483114-anim-DDS-B.gif (200"x200" crop).

The star has an ultraviolet counterpart GALEX J231917.0+483115 (NUV=21.61+/-0.32). It is absent in USNO-B1.0, 2MASS, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, CSS and NEAT.

Based on the blue color, amplitude of variability and presence of a previous outburst we conclude that MASTER OT J231917.03+483114.2 is a new cataclysmic variable (dwarf nova). According to observations by R. Koff (CBAT TOCP) the object has faded below 20m by Oct. 18.124 UT. Follow up observations in search for future outbursts are encouraged.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/231917.03483114.2.png

MASTER OT J065222.27+332451.9 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 52m 22.27s +33d 24m 51.9s on 2012-10-20.78414 UT. The OT unfiltered magnitude is 17.4m (limit 18.9m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2011-11-20.85920 UT with magnitude limit in 'R' filter 18.6m.

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, GALEX and CSS.

This star was detected in outburst on the Quick-V photovisual plate taken on 1982 Oct. 21, but not visible on 5 other digitized Palomar plates and their combination (m_lim~21.5). Color-combined (OVR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J065222+332451-OVR.jpg (10'x10' FOV).

The position of MASTER OT J065222.27+332451.9 was observed by Palomar/NEAT project with 33 images taken on 10 different nights from 2001 Dec. 19 to 2003 Mar. 07. Object was in outburst on a single image of 2002 Oct. 13 and below the detection limit (~20m) on all other images.

Based on the amplitude of variability and presence of two previous outbursts we conclude that MASTER OT J065222.27+332451.9 is a new cataclysmic variable (dwarf nova). The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/065222.27332451.9.png

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