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Flare Star and New Cataclysmic Variable discovered by MASTER

ATel #6693; P. Balanutsa, V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, M. Pruzhinskaya, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), 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), 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), S. Shurpakov (MASTER team member)
on 13 Nov 2014; 18:45 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J012838.97+053004.6 - flaring red dwarf

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 01h 28m 38.97s +05d 30m 04.6s on 2014-11-11.86256 UT. The OT unfiltered magnitude is 18.2m (limit 19.4m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2014-11-11.81866 UT (1 hour earlier) with unfiltered magnitude limit 20.1m. The object has reached maximum on the second of three images (60-sec exposures): 20:42:05 UT, 18.21m; 20:43:33 UT, 17.30m; 20:45:01 UT, 17.48m.

The OT at quiescence is identical to the red star SDSS J012838.93+053004.7 (g=24.37 r=22.15 i=20.18) = AllWISE J012838.94+053004.4 (W1=16.12 W2=16.33). The object is not present in USNO-B, 2MASS, GCVS and AAVSO VSX.

Based on the red color and short flare duration, MASTER OT J012838.97+053004.6 is a new variable of UV Ceti type (flaring red dwarf). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/012838.97053004.6.jpg

MASTER OT J191906.08-180501.3 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 19m 06.08s -18d 05m 01.3s on 2014-11-12.63627 UT. The OT unfiltered magnitude is 15.7m (limit 18.4m). The OT is seen in 8 images. There is no minor planet at this place. We have reference image without OT on 2014-08-30.79381 UT with unfiltered magnitude limit 18.0m.

The OT at quiescence is identical to the blue star USNO-A2.0 0675-32587347 (19 19 06.08 -18 05 01.1 B=18.4 R=17.6) = USNO-B1.0 0719-0992475 (19 19 06.07 -18 05 01.2 B1=19.90 B2=18.18 R2=18.37). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J191906-180501-VRIR.jpg (10'x10' FOV). Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Sagittarius is not covered by SDSS, GALEX and Catalina Sky Survey. There are 39 NEAT images on 15 different nights from 2001 May 08 to 2002 June 28. No previous outbursts were detected.

Based on the blue color and amplitude of variability, MASTER OT J191906.08-180501.3 is a new 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/191906.08-180501.3.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net