Two new CVs detected by MASTER

ATel #5574; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, 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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 12 Nov 2013; 18:05 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J065856.61+504935.8 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 06h 58m 56.61s +50d 49m 35.8s on 2013-11-11.68470 UT. The OT unfiltered magnitude is 16.3m (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 2012-11-14.89775 UT with unfiltered magnitude limit 19.8m.

The object at quiescence is identical to the faint blue star present in catalogues as USNO-A2.0 1350-06914678 (06 58 56.50 +50 49 35.2 R=19.5 B=19.9) and USNO-B1.0 1408-0187289 (06 58 56.536 +50 49 35.09 B1=20.13 R1=20.07 B2=21.14). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J065856+504935-BRIR.jpg (10'x10' FOV).

The OT has an UV counterpart GALEX J065856.5+504934 (FUV=19.39+/-0.10, NUV=19.14+/-0.06). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Lynx is not covered by SDSS, NEAT and CRTS.

Based on the blue color and outburst amplitude (~5m), MASTER OT J065856.61+504935.8 is likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/065856.61504935.8.png

MASTER OT J192019.35+443905.3 - new CV in Kepler field

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 19h 20m 19.35s +44d 39m 05.3s on 2013-11-12.40569 UT. The OT unfiltered magnitude is 17.1m (limit 18.1m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2012-10-10.57873 UT with unfiltered magnitude limit 18.8m.

There is a faint blue star near the OT on Palomar plates. It is present in GSC 2.3.2 with coordinates 19 20 19.350 +44 39 04.74 and jmag=22.28. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J192019+443905-BRIR5x5.jpg (2x zoom).

There is nothing at this position in 1RXS, GALEX, USNO-B1, 2MASS, GCVS and AAVSO VSX. This area of sky in Cygnus is not covered by SDSS, NEAT and CRTS.

Based on the blue color and outburst amplitude (~5m), MASTER OT J192019.35+443905.3 is most likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/192019.35443905.3.png

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