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Two new CVs detected by MASTER

ATel #5657; S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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 Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 13 Dec 2013; 13:23 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J032250.48+423103.2 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 03h 22m 50.48s +42d 31m 03.2s on 2013-12-10.51594 UT. The OT unfiltered magnitude is 17.5m (limit 18.0m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-09-06.79831 UT with magnitude limit in R filter 19.3m.

The OT at quiescence is identical to the star SDSS J032250.42+423103.9 (u=21.52 g=21.47 r=20.73 i=20.11 z=19.57). There is nothing at this position in USNO-B, 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Perseus is not covered by CRTS and NEAT.

Based on the color and outburst amplitude (~4m), MASTER OT J032250.48+423103.2 is likely a cataclysmic variable of SS Cyg (UGSS) type in outburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/032250.48423103.2.png

MASTER OT J043220.15+784913.8 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 04h 32m 20.15s +78d 49m 13.8s on 2013-12-12.60299 UT. The OT unfiltered magnitude is 16.8m (limit 18.5m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-03-04.52638 UT with unfiltered magnitude limit 17.7m.

The OT at quiescence is identical to the blue star USNO-B1.0 1688-0023847 (04 32 20.664 +78 49 14.09 B1=19.00 B2=21.70) = USNO-A2.0 1650-00844741 (04 32 20.65 +78 49 13.8 R=18.6 B=18.4). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J043220+784913-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J043220.6+784914 (FUV=18.72+/-0.07 NUV=18.66+/-0.05). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Camelopardalis is not covered by SDSS, CRTS and NEAT.

Based on the blue color, UV detection and amplitude of variability (~4m), MASTER OT J043220.15+784913.8 is a cataclysmic variable (dwarf nova in outburst). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/043220.15784913.8.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net