Two possible new CV and one PSN detected by MASTER

ATel #4579; A. Frolova (Irkutsk State University), S. Shurpakov, D. Denisenko, V. Lipunov, P. Balanutsa, N. Tiurina, E. Gorbovskoy, 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), P. Podvorotny, V. Shumkov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 16 Nov 2012; 07:36 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J230207.47+773104.0 - new CV in outburst

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 23h 02m 07.47s +77d 31m 04.0s on 2012-11-13.57846 UT. The OT unfiltered magnitude is 18.5m (limit 19.5m). The OT is seen in 3 images. There is no minor planet at this place.

We have reference image without OT on 2011-10-04.63646 UT with unfiltered magnitude limit 19.5m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/230207.47773104.0.png

There is nothing at this position in USNO-B1.0, 2MASS, 1RXS, GCVS catalogs and in AAVSO VSX. This area is not covered by GALEX, NEAT, CRTS and SDSS. However, there is a blue star on digitized Palomar plates which is present in GSC 2.3.2 catalog with coordinates 23 02 07.774 +77 31 04.13 and Jmag=19.42. The star was in outburst on 1992 Nov. 17 plate and at quiescence on all other images. Comparison of 1992 Nov. 17 and 1993 July 26 blue DSS plates is available at http://master.sai.msu.ru/static/OT/J230207+773104-DSS-Blue.jpg

Based on the amplitude of variability and presence of previous outburst we conclude that MASTER OT J230207.47+773104.0 is the new cataclysmic variable (dwarf nova). Follow up observations are encouraged.

MASTER OT J235317.35+142433.8 - PSN in SDSS J235317.41+142434.4

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 23h 53m 17.35s +14d 24m 33.8s on 2012-11-15.56586 UT. The OT unfiltered magnitude is 17.8m (limit 19.5m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2011-12-18.52405 UT with unfiltered magnitude limit 20.1m. There is a galaxy within 1" of the OT in SDSS DR8 SDSS J235317.41+142434.4 (g=20.42 r=19.94 i=19.69). It is also present in GALEX catalog as GALEX J235317.4+142434 (FUV=22.25+/-0.18 NUV=22.27+/-0.17) and in USNO-B1.0 as USNO 1044-0663403 (B2=20.37 R2=19.73 I=19.31).

No previous outbursts were found in CRTS database on 148 images during 2004-2012 and in NEAT data on 42 images taken in 1997-2002.

Spectroscopic confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/235317.35142433.8.png

MASTER OT J064058.32+213814.1 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 40m 58.32s +21d 38m 14.1s on 2012-11-15.73451 UT. The OT unfiltered magnitude is 17.3m (limit 18.3m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-10-20.80144 UT with unfiltered magnitude limit 18.9m. MASTER OT J064058.32+213814.1 - new CV

Nothing is present at the position of the OT in 2MASS, USNO-B1.0, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area is not covered by CRTS, SDSS and GALEX. There is a faint star visible at the limit of blue Palomar plates, but not on R and I images. It is listed in GSC 2.3.2 with coordinates 06 40 58.275 +21 38 13.10 and Jmag=22.10.

No previous outbursts were found on 6 NEAT images obtained on 2002 Oct. 03 and 04.

The galactic latitude is +7.5 deg. Based on amplitude of variability we conclude that MASTER OT J064058.32+213814.1 is a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are encouraged.The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/064058.32213814.1.png

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