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Two Flare Stars discovered by MASTER

ATel #6104; D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, 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), 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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 29 Apr 2014; 13:41 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Transient, Variables

MASTER OT J120525.84+621743.3 - flaring red dwarf

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 12h 05m 25.84s +62d 17m 43.3s on 2014-04-26.59837 UT. The OT unfiltered magnitude is 17.6m (limit 19.3m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2012-02-25.71308 UT with unfiltered magnitude limit 20.0m. The object was first detected at 16.8m on 2014-04-26.59685 UT fading by 0.8m in 2 minutes. It was not present on the second triplet of images taken 1.1 hr later, on 2014-04-26.646 UT to the limiting magnitude 19.2.

The OT at quiescence is identical to the red star of M7 spectral class USNO-B1.0 1522-0240463 (12 05 25.939 +62 17 43.67 pmRA=-28 pmDE=12 R1=19.64 R2=20.21 I=18.26) = SDSS J120525.86+621743.1 (g=22.96 r=21.55 i=19.23) = 2MASS J12052592+6217427 (J=16.20+/-0.11 H=15.37+/-0.12 K=15.49+/-0.26) = AllWISE J120525.87+621743.0 (W1=15.15 W2=14.87). There is nothing at this position in 1RXS, GALEX, GCVS and AAVSO VSX.

Based on the spectrum, amplitude and rapid fading MASTER OT J120525.84+621743.3 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/120525.84621743.3.png

MASTER OT J191429.21+441950.5 - flaring red dwarf in Kepler field

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 19h 14m 29.21s +44d 19m 50.5s on 2014-04-27.76897 UT. The OT unfiltered magnitude is 15.5m (limit 18.2m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2012-10-10.57873 UT with unfiltered magnitude limit 18.8m. The object was not present on the second triplet of images taken 45 minutes later, on 2014-04-27.768 UT to the limiting magnitude 18.2.

The OT at quiescence is identical to the red star USNO-B1.0 1343-0344929 (19 14 29.153 +44 19 51.31 R1=18.45 B2=20.71 R2=18.40 I=16.39) = 2MASS J19142915+4419509 (J=15.54+/-0.05 H=14.84+/-0.06 K=14.56+/-0.08) = AllWISE J191429.15+441950.8 (W1=14.54 W2=14.37). There is nothing at this position in 1RXS, GALEX, GCVS and AAVSO VSX. This area of sky in Cygnus is not covered by SDSS. The star was included in Kepler input catalog as KIC 8357282.

Based on the color, amplitude and rapid fading MASTER OT J191429.21+441950.5 is a new variable of UV Ceti type. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/191429.21441950.5.png

Corrigendum to ATel #6069

MASTER OT J140957.49+290922.7 at quiescence is identical to the red star SDSS J140957.57+290921.8 (g=23.44 r=21.91 i=19.45). SDSS name was missing in the original text of the telegram.

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net