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Three New Cataclysmic Variables by MASTER

ATel #5698; D. Denisenko, V. Yecheistov, P. Balanutsa, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov (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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 27 Dec 2013; 07:08 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J022033.47+402248.8 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 02h 20m 33.47s +40d 22m 48.8s on 2013-12-25.75934 UT. The OT unfiltered magnitude is 17.9m (limit 19.3m). The OT is seen in 14 images varying from 17.4 to 18.2m in the course of 45 minutes. We have unfiltered reference image on 2010-12-09.75513 UT with OT at 20.4m (limit 21.6m).

The OT at quiescence is identical to the blue star USNO-B1.0 1303-0039367 (02 20 33.498 +40 22 49.35 B1=20.93 B2=20.04). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J022033+402248-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J022033.4+402249 (NUV=20.59+/-0.23).

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Andromeda is not covered by SDSS. The object is showing both long-term and intra-night variability in Catalina Sky Survey data.

Based on the blue color, amplitude of variability (~3m) and short-term brightness changes, MASTER OT J022033.47+402248.8 is most likely a 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/022033.47402248.8.png

MASTER OT J034045.31+471632.2 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 03h 40m 45.31s +47d 16m 32.2s on 2013-12-26.49604 UT. The OT unfiltered magnitude is 15.6m (limit 17.7m). The OT is seen in 12 images. We have reference image without OT on 2013-10-17.58745 UT with unfiltered magnitude limit 17.4m.

The OT at quiescence is identical to the blue star USNO-A2.0 1350-03732402 (03 40 45.37 +47 16 32.3 R=17.9 B=18.5) = USNO-B1.0 1372-0106310 (03 40 45.300 +47 16 32.13 pmRA=-8 pmDE=-6 B1=19.27 R1=17.68 B2=18.56 R2=18.54 I=17.41) = SDSS J034045.29+471631.6 (u=17.69 g=17.34 r=17.22 z=17.17 i=17.10).

The star was in outburst on 1993 Jan. 23 blue Palomar plate and at quiescence on 8 other DSS plates. Comparison of 1989 Sep. 12 and 1993 Jan. 23 blue plates is uploaded to http://master.sai.msu.ru/static/OT/J034045+471632-POSS-B.jpg (4'x4' FOV). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Perseus is not covered by CRTS and GALEX.

Based on the blue color in SDSS, MASTER OT J034045.31+471632.2 is most likely a dwarf nova of SU UMa (UGSU) type with a short orbital period. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/034045.31471632.2.png

MASTER OT J035733.12+640028.5 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 03h 57m 33.12s +64d 00m 28.5s on 2013-12-26.79781 UT. The OT unfiltered magnitude is 17.7m (limit 19.1m). The OT is seen in 11 images. We have reference image without OT on 2010-09-17.91590 UT with unfiltered magnitude limit 19.4m.

There is a faint star (~21.5m) at this position at the limit of digitized Palomar plates. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J035733+640028-BRIR5x5.jpg (2x zoom). There is nothing at this position in any catalogs. This area of sky in Camelopardalis is not covered by SDSS and CRTS.

Based on the amplitude of variability (~4m) MASTER OT J035733.12+640028.5 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/035733.12640028.5.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net