MASTER: new UV-type variable star and 2 OH masers' optical variability
ATel #7147; S. Shurpakov, P. Balanutsa, O. Gress, V. Lipunov, E. Gorbovskoy, S. Antipin, N. Tiurina , V. Kornilov, A. Kuznetsov, V. Shumkov, V. Chazov, V. Vladimirov (Lomonosov Moscow State University, SAI), K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University)
on 26 Feb 2015; 22:19 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, Transient, Variables
MASTER OT J110235.37+271333.0 - UV Cet type
MASTER-Tunka auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 11h 02m 35.37s +27d 13m 33.0s on 2015-02-23.73913 UT.
The OT unfiltered magnitude is 18.2m (the limit is 19.9m).
There are 4 images with OT in MASTER-Tunka database.
We have reference image without OT on 2011-03-30.65373 UT with 19.9 unfiltered magnitude limit.
This OT is identical to Sloan J110235.41+271332.2 star with Rmag=22.453 and Imag=20.533.
The discovery and reference images and optical decay are available at
http://master.sai.msu.ru/static/OT/MASTERJ110235.37+271333.0.jpg
Spectral observations are required.
MASTER OT J190436.33+192828.7 - optical variability of OH MASER (Mira type)
MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 04m 36.33s +19d 28m 28.7s on 2015-02-23.08345 UT.
The OT unfiltered magnitude is 14.0m (the limit is 18.6m).
The OT is seen in 18 images. There is no minor planet at this place.
We have reference image without OT on 2014-08-30.80163 UT with 18.9 unfiltered magnitude limit.
This star is identical to 19024+1923 OH Maser source (Nakashima+, 2003).
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTERJ190436.33+192828.7
MASTER OT J185302.95+091634.3 - optical variability of OH MASER (Mira type)
MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 18h 53m 02.95s +09d 16m 34.3s on 2015-02-21.92802 UT.
The OT unfiltered magnitude is 14.1m (the limit is 16.7m).
There are 12 images with OT on 2015-02-21 and reference image without OT on 2014-09-15.61266 UT with 17.9 unfiltered magnitude limit in MASTER-Tunka database. There is no minor planet at this place.
http://master.sai.msu.ru/static/OT/MASTERJ185302.95+091634.3.jpg
List of Optical Transients discovered by MASTER
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Global MASTER Robotic Net