Three New Cataclysmic Variables by MASTER

ATel #5950; V. Vladimirov, D. Denisenko, S. Shurpakov, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov (Moscow State University, SAI), 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), 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 5 Mar 2014; 11:20 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J051042.59+513540.0 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 05h 10m 42.59s +51d 35m 40.0s on 2014-02-28.52878 UT. The OT unfiltered magnitude is 17.6m (limit 18.6m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-02-17.61772 UT with unfiltered magnitude limit 19.4m.

The OT at quiescence is identical to the blue star USNO-B1.0 1415-0155281 (05 10 42.591 +51 35 40.42 pmRA=-22 pmDE=32 B1=21.03 R1=N/A B2=20.70 R2=19.37 I=N/A). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J051042+513540-BRIR5x5.jpg (2x zoom). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Auriga is not covered by SDSS, NEAT and CRTS.

Based on the blue color, proper motion and amplitude of variability (~3m), MASTER OT J051042.59+513540.0 is a cataclysmic variable. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/051042.59513540.0.png

MASTER OT J151922.15+392537.5 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 15h 19m 22.15s +39d 25m 37.5s on 2014-03-02.78428 UT. The OT unfiltered magnitude is 16.7m (limit 18.2m). The OT is seen in 5 images. We have reference image without OT on 2012-09-07.53039 UT with unfiltered magnitude limit 18.4m.

The OT at quiescence is identical to the blue star SDSS J151922.22+392538.9 (u=21.81 g=21.49 r=22.06 i=21.81 z=20.41) = USNO-B1.0 1294-0252328 (15 19 22.237 +39 25 38.97 pmRA=10 pmDE=22 B1=21.08 R1=N/A B2=21.26 R2=20.46 I=N/A). There is also an UV counterpart GALEX J151922.1+392538 (FUV=21.08+/-0.42 NUV=21.98+/-0.32).

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. Object was at minimum light on 9 DSS plates. No previous outbursts were detected by Catalina Sky Survey. This area of sky in Bootes is not covered by NEAT.

Based on the blue color and outburst amplitude (~5m), MASTER OT J151922.15+392537.5 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/151922.15392537.5.png

MASTER OT J105545.20+573109.7 - new large amplitude CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 10h 55m 45.20s +57d 31m 09.7s on 2014-03-04.74875 UT. The OT unfiltered magnitude is 15.5m (limit 18.8m). The OT is seen in 5 images. We have reference image without OT on 2011-04-05.57701 UT with unfiltered magnitude limit 20.1m.

The OT at quiescence is identical to the blue star SDSS J105545.15+573110.1 (u=22.39 g=22.16 r=21.88 i=22.55 z=21.91). There is also an UV counterpart GALEX J105545.2+573109 (FUV=23.44+/-0.10 NUV=22.75+/-0.07) and X-ray source 2XMM J105545.1+573109 = CXO J105545.2+573109.

There is nothing at this position in 1RXS, 2MASS, USNO, GCVS and AAVSO VSX. No previous outbursts were detected by CSS. This area of sky in Ursa Major is not covered by NEAT.

Based on the blue color and outburst amplitude (~6m), MASTER OT J105545.20+573109.7 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/105545.20573109.7.png

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