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Two new CVs in Auriga detected by MASTER

ATel #5481; V. Vladimirov, S. Shurpakov, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, 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, A. Frolova (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 and F. Podest (OAFA)
on 17 Oct 2013; 15:46 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J061335.30+395714.7 - new bright CV with large outburst amplitude

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 13m 35.30s +39d 57m 14.7s on 2013-10-15.72662 UT. The OT unfiltered magnitude is 14.3m (limit 18.5m). The OT is seen in 4 images. Magnitudes measured by the robot: Oct. 15.686 UT, 14.20; 15.727, 14.26; 15.755, 14.17; 15.783, 14.21. Photometric errors are 0.01-0.02m. We have reference image without OT on 2011-11-02.74189 UT with magnitude limit in 'V' filter 19.2m.

There is nothing at this position in 1RXS, GALEX, 2MASS, USNO, GCVS and AAVSO VSX. Object is not visible on 12 NEAT images obtained on 4 different nights in Dec. 2001 - Feb. 2002, as well as on their sum down to m_lim~22. Nothing is present at the position of the OT on 6 digitized Palomar plates and their combination to m_lim~21. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J061335+395714-BRIR.jpg (10'x10' FOV). This area of sky in Auriga is not covered by SDSS and CRTS.

Based on the outburst amplitude (more than 7m), MASTER OT J061335.30+395714.7 is most likely a dwarf nova of WZ Sge (UGWZ) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/061335.30395714.7.png

MASTER OT J063943.46+361127.5 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 39m 43.46s +36d 11m 27.5s on 2013-10-15.72884 UT. The OT unfiltered magnitude is 17.1m (limit 17.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-10-19.77485 UT with unfiltered magnitude limit 18.8m.

The object at quiescence is identical to the blue star SDSS J063943.50+361127.4 (u=22.72, g=22.86, r=22.66, i=22.17, z=22.33). There is nothing at this position in 1RXS, GALEX, 2MASS, USNO, GCVS and AAVSO VSX. No previous outbursts were detected by CRTS and on 12 NEAT images from 4 nights in Dec. 2001 - Feb. 2002. Object is not visible on 9 digitized POSS plates.

Based on SDSS color and outburst amplitude (about 5m), MASTER OT J063943.46+361127.5 is most likely a dwarf nova of SU UMa (UGSU) type in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/063943.46361127.5.jpg

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net