Three Cataclysmic Variables discovered by MASTER

ATel #5726; V. Vladimirov, S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), 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), 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 6 Jan 2014; 11:55 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J025737.69+333750.7 - new CV of AM Her type

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 02h 57m 37.69s +33d 37m 50.7s on 2013-12-31.74506 UT. The OT unfiltered magnitude is 18.6m (limit 19.7m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2011-10-26.95117 UT with unfiltered magnitude limit 20.1m.

The OT at quiescence is identical to the blue star USNO-B1.0 1236-0048795 (02 57 37.729 +33 37 50.69 pmRA=0 pmDE=-16 B1=20.75 R1=N/A B2=20.08 R2=N/A I=18.66) = SDSS J025737.74+333750.5 (u=21.40 g=21.23 r=21.29 i=21.29 z=21.26). There is also an UV counterpart GALEX J025737.7+333750 (NUV=21.45+/-0.26). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX.

Object is showing large variability on NEAT images available from SkyMorph web site. It was in low state (fainter than 20m) in Dec. 1997, Oct. 2001 and Jan.-Feb. 2002 and in high state in Oct. 2002 - Feb. 2003. Object is varying by 0.8m on the time scale of 30 minutes. Using 29 observations on 9 different nights from 2002 Oct. 13 to 2003 Feb. 01 we have obtained orbital period value of 0.062508d.

Based on the blue color and amplitude of variability (~3m), MASTER OT J025737.69+333750.7 is a new cataclysmic variable of AM Her type (polar). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/025737.69333750.7.png

MASTER OT J113049.13+263831.6 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 11h 30m 49.13s +26d 38m 31.6s on 2014-01-01.98625 UT. The OT unfiltered magnitude is 17.6m (limit 19.4m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2013-11-10.05123 UT with unfiltered magnitude limit 19.0m.

There is nothing at this position in any catalogs, on DSS plates to limiting magnitude ~21m and on SDSS color image to ~23.5m. Based on the and amplitude of variability (~6m), MASTER OT J025737.69+333750.7 is most likely a new cataclysmic variable of SU UMa type (dwarf nova) in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/113049.13263831.6.png

MASTER OT J020623.07+504444.8 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 02h 06m 23.07s +50d 44m 44.8s on 2014-01-03.81832 UT. The OT unfiltered magnitude is 16.6m (limit 19.1m). The OT is seen in 7 images. There is no minor planet at this place. We have reference image without OT on 2013-11-06.79426 UT with unfiltered magnitude limit 19.1m.

The OT at quiescence is identical to the blue star USNO-A2.0 1350-01971894 (02 06 23.02 +50 44 45.1 R=18.7 B=18.9) = USNO-B1.0 1407-0055232 (02 06 23.028 +50 44 44.88 B1=20.08 R1=18.75 B2=20.67 R2=N/A I=18.36). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J020623+504444-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J020623.2+504444 (FUV=21.51+/-0.38 NUV=20.84+/-0.26).

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

MASTER OT J020623.07+504444.8 is a dwarf nova in outburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/020623.07504444.8.png

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