New Cataclysmic Variable in Andromeda detected by MASTER

ATel #5774; S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), 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), 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 18 Jan 2014; 13:46 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J003059.39+301634.3 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 00h 30m 59.39s +30d 16m 34.3s on 2014-01-17.47291 UT. The OT unfiltered magnitude is 16.1m (limit 18.1m). The OT is seen in 7 images. There is no minor planet at this place. We have reference image with OT at unfiltered magnitude 18.6m on 2011-11-19.63458 UT (limit 19.5m). The OT has faded by 0.5m (to 16.6m) on the images obtained 45 minutes later, on 2014-01-17.504 UT.

The OT at quiescence is identical to the blue star USNO-A2.0 1200-00232738 (00 30 59.46 +30 16 34.9 R=18.2 B=18.7) = USNO-B1.0 1202-0006789 (00 30 59.439 +30 16 34.72 B1=18.96 R1=18.47 B2=19.97 R2=19.21 I=N/A) = SDSS J003059.40+301634.4 (u=18.27 g=18.07 r=18.03 i=18.03 z=18.03). There is also an UV counterpart GALEX J003059.3+301635 (NUV=20.90+/-0.25).

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. Object was at minimum light on 6 DSS plates and on 39 Palomar/NEAT images on 11 different nights from 2001 Aug. 14 to 2002 Dec. 03. This area of sky in Andromeda was observed by Catalina Sky Survey with 260 detections from June 2005 to Sep. 2013. Object is varying from 18.8m to below 20m at quiescence with three outbursts as bright as 16.4m on 2007 Oct. 16 fading to 17.4m on Oct. 21. The light curve is available at CRTS web site: CSS J003059.3+301634.

Based on the blue color, amplitude of variability (~3m) and historical light curve MASTER OT J003059.39+301634.3 is a cataclysmic variable, most likely an eclipsing dwarf nova in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/003059.39301634.3.png

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