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MASTER Discovery of a Large Amplitude Cataclysmic Variable

ATel #6851; V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov (Lomonosov Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), S. Shurpakov (MASTER team member)
on 27 Dec 2014; 14:45 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable

MASTER OT J031600.08+175824.4 - new large amplitude CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 03h 16m 00.08s +17d 58m 24.4s on 2014-12-27.55126 UT. The OT unfiltered magnitude is 15.1m (limit 18.9m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2011-02-01.55030 UT with unfiltered magnitude limit 19.5m.

The OT at quiescence is identical to the blue star SDSS J031600.12+175824.2 (g=22.17 r=22.07 i=21.62). There is a possible UV counterpart GALEX J031600.0+175825 (NUV=21.45+/-0.43). Nothing is present at this position in 1RXS, USNO-B, 2MASS, GCVS and AAVSO VSX.

This area of sky in Aries was observed by NEAT project on 35 different nights from 1995 Dec. 23 to 2006 Dec. 22 with about 100 images. No outbursts were detected. There is a possible past outburst in Mount Lemmon Survey data.

Based on the amplitude of variability (~7m), MASTER OT J031600.08+175824.4 is a new cataclysmic variable, most likely a dwarf nova of UGSU subtype in superoutburst. The object has brightened by 0.1m (to 15.0m) on the unfiltered MASTER-Tunka images obtained 1.2 hours after the discovery. The outburst has been caught at the early stage. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/031600.08175824.4.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net