New Cataclysmic Variable in Aquarius discovered by MASTER

ATel #6578; V. Vladimirov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov (Lomonosov Moscow State University, SAI), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (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, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Shumkov, S. Shurpakov (MASTER team members)
on 14 Oct 2014; 09:26 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J220303.17-134505.3 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 22h 03m 03.17s -13d 45m 05.3s on 2014-10-13.72115 UT. The OT unfiltered magnitude is 16.7m (limit 19.9m). The OT is seen in 12 images. There is no minor planet at this place. We have reference image without OT on 2014-05-28.99922 UT with unfiltered magnitude limit 19.3m.

There is a faint blue star within 1" of the OT with jmag=21.26 in GSC 2.3.2. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J220303-134505-JRIR.jpg (10'x10' FOV). There is also an UV counterpart GALEX J220303.1-134504 (NUV=20.75+/-0.26). Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Aquarius is not covered by SDSS. No outbursts were detected by Catalina Sky Survey.

NEAT project has observed this field on 35 nights from 1997 Oct. 26 to 2006 Sep. 29 with a total of 102 images. The object was in outburst on three 2002 May 29 images and at quiescence on other nights, including 2002-05-27 and 2002-06-08. Comparison of 2002 May 29 and June 08 images is posted at http://master.sai.msu.ru/static/OT/J220303-134505-NEAT-2002.jpg (5'x5' FOV).

Based on the blue color, amplitude of variability (about 4m) and previous outburst in 2002, MASTER OT J220303.17-134505.3 is a new cataclysmic variable (dwarf nova). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/220303.17-134505.3.png

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