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Three new CVs detected by MASTER

ATel #5691; P. Balanutsa, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), 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 25 Dec 2013; 12:50 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J040556.85+714813.1 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 04h 05m 56.85s +71d 48m 13.1s on 2013-12-23.77628 UT. The OT unfiltered magnitude is 18.2m (limit 19.0m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-01-26.67021 UT with magnitude limit in R filter 19.7m.

GSC 2.3.2 has a star at 1" distance with coordinates 04 05 56.992 +71 48 14.12 and jmag=20.32. The star was in outburst on 1994 Jan. 09 POSS-II blue plate and at quiescence on 8 other Palomar plates. Comparison of 1993-09-25 and 1994-01-09 blue plates is posted at http://master.sai.msu.ru/static/OT/J040556+714813-POSS-B.jpg (4'x4' FOV). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J040556+714813-BRIR5x5.jpg (2x zoom). There is nothing at this position in 1RXS, GALEX, USNO, 2MASS, GCVS and AAVSO VSX. This area of sky in Camelopardalis is not covered by SDSS and CRTS.

Based on the previous outburst detection we conclude that MASTER OT J040556.85+714813.1 is a cataclysmic variable (dwarf nova). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/040556.85714813.1.png

MASTER OT J043252.44+304855.7 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 04h 32m 52.44s +30d 48m 55.7s on 2013-12-23.80252 UT. The OT unfiltered magnitude is 17.9m (limit 19.1m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-01-13.73130 UT with unfiltered magnitude limit 21.1m.

There is nothing at this position in any catalogs. This area of sky in Taurus is not covered by SDSS. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J043252+304855-BRIR5x5.jpg (2x zoom).

MASTER OT J043252.44+304855.7 is likely 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/043252.44304855.7.png

MASTER OT J061837.94-124658.2 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 06h 18m 37.94s -12d 46m 58.2s on 2013-12-23.81671 UT. The OT unfiltered magnitude is 17.8m (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 2013-12-23.78162 UT with unfiltered magnitude limit 18.8m.

The OT at quiescence is identical to the star USNO-B1.0 0772-0110985 (06 18 37.911 -12 46 58.40 B1=20.88 B2=19.54). It was in outburst on 1983 Feb. 14 DSS blue plate and at quiescence on 9 other images. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J061837-124658-JRIR5x5.jpg (2x zoom). There is nothing at this position in 1RXS, GCVS and AAVSO VSX. This area of sky in Canis Major is not covered by SDSS and GALEX.

MASTER OT J061837.94-124658.2 is a 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/061837.94-124658.2.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net