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Three Flare Stars and New CV detected by MASTER

ATel #5395; V. Yecheistov, D. Denisenko, P. Balanutsa, S. Shurpakov, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), 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 and F. Podest (OAFA)
on 17 Sep 2013; 07:50 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J015234.39+260302.4 - flaring star

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 01h 52m 34.39s +26d 03m 02.4s on 2013-09-14.82097 UT. The OT unfiltered magnitude is 17.1m (limit 18.6m). The OT is seen in 6 images. We have reference image without OT on 2011-12-01.57542 UT with m_lim=19.5.

The object has faded by 0.4m in 4 minutes: Sep. 14.821, 17.1; 14.822, 17.3; 14.824, 17.5. It is identical to the red star SDSS J015234.36+260303.0 (u=25.83 g=24.70 r=22.63 i=20.58 z=19.27). The OT is most likely a flaring red dwarf.

Follow up observations are encouraged. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/015234.39260302.4.jpg

MASTER OT J171336.41+783648.1 - flaring star

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 17h 13m 36.41s +78d 36m 48.1s on 2013-09-16.55775 UT. The OT unfiltered magnitude is 16.2m (limit 18.7m). The OT is seen in 2 images. We have reference image without OT on 2010-08-23.58601 UT with m_lim=18.4. The OT was present on 2013-09-16.55908 UT image at 16.1m, but not visible on the next triplet of images centered on Sep. 16.591 UT (limit 18.7m), fading by more than 2.5m in 48 minutes.

The object is identical to the red star USNO-B1.0 1686-0062535 (17 13 36.289 +78 36 48.87 R2=19.69 I=18.63) and SDSS J171336.35+783648.4 (u=23.93 g=22.27 r=20.64 i=19.22 z=18.47). Short flare duration, amplitude and red color are typical for UV Ceti stars.

Follow up observations are encouraged. Discovery and reference images: http://master.sai.msu.ru/static/OT/171336.41783648.1.jpg

MASTER OT J011626.66+551730.5 - flaring star

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 01h 16m 26.66s +55d 17m 30.5s on 2013-09-16.71543 UT. The OT unfiltered magnitude is 15.3m (limit 18.4m). The OT is seen in 6 images. We have reference image without OT on 2013-05-01.72632 UT with m_lim=17.5.

After reaching the maximum brightness, the object has faded by ~2.5m on the images taken 1h45m later:

Sep.UT magn. err. 
----------------- 
16.715 15.38 0.03 
16.716 15.32 0.03 
16.717 15.49 0.04 
16.718 15.59 0.05 
16.719 15.74 0.06 
16.720 15.81 0.07 
16.789 17.8: 0.21 
16.790 17.5: 0.17 
16.791 18.3: 0.27

The OT is identical to the red star USNO-B1.0 1452-0041756 (01 16 26.652 +55 17 29.82 pmRA=8 pmDE=-2 R1=18.47 B2=20.25 R2=18.75 I=16.49) = 2MASS J01162665+5517295 (J=15.01 H=14.44 K=14.06). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J011626+551730-BRIR.jpg (10'x10' FOV).

The OT is flaring star of UV Ceti type. Follow up observations are encouraged. Discovery and reference images: http://master.sai.msu.ru/static/OT/011626.66551730.5.png

MASTER OT J012836.52+532830.6 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 01h 28m 36.52s +53d 28m 30.6s on 2013-09-16.72201 UT. The OT unfiltered magnitude is 16.8m (limit 18.4m). The OT is seen in 4 images. We have reference image without OT on 2012-09-24.68692 UT with m_lim=19.0.

The OT is identical to the blue star USNO-B1.0 1434-0048065 (B1=19.51 B2=17.59). It was in outburst on 1987-10-16 Blue POSS plate and at quiescence on 8 other DSS images. Color-combined (BRIR) finder chart: http://master.sai.msu.ru/static/OT/J012836+532830-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J012836.4+532829 (NUV=20.67+/-0.20).

Based on the blue color we conclude that MASTER OT J012836.52+532830.6 is a new cataclysmic variable, most likely a dwarf nova in outburst. Follow up observations are required. Discovery and reference images: http://master.sai.msu.ru/static/OT/012836.52532830.6.png

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