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Three OTs detected by MASTER

ATel #4458; P. Balanutsa, D. Denisenko, N. Tiurina, E. Gorbovskoy, V. Lipunov, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), P. Podvorotny, S. Shurpakov, V. Shumkov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 7 Oct 2012; 08:54 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable

OT MASTER J225118.18+191800.9 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 22h 51m 18.18s +19d 18m 00.9s on 2012-10-01.92683 UT. The OT unfiltered magnitude is 17.9m (limit 18.1m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-11-07.69839 UT with unfiltered magnitude limit 20.2m. There is galaxy J225118.11+191801.9 in the SDSS Photometric Catalog (rmag=20.5) with 1.8 arcsec offset.

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/225118.18191800.8_3.png

OT MASTER J194741.84-020348.9 - new ?V

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 47m 41.84s -02d 03m 48.4s on 2012-10-04.66721 UT. The OT unfiltered magnitude is 16.8m (limit 18.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-09-27.74685 UT with unfiltered magnitude limit 18.8m.

There is nothing at the position of the OT in USNO-B1.0, GSC 2.3.2, 2MASS, GALEX, 1RXS, GCVS catalogs and in AAVSO VSX. This area is not covered by SDSS. The galactic latitude is -13 deg.

There is a faint object (magnitude ~21.5) within 1" from the position of the OT visible on the sum of POSS-II plates. There are no previous outbursts on any of 11 available DSS plates. This field was observed by the NEAT project on two nights (2002 May 13 and 15). Five images were obtained, no outbursts were detected.

Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J194741-020348-BRIR5x5.jpg (5'x5' FOV).

Based on the amplitude of variability we suggest that MASTER OT J194741.84-020348.4 is likely a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194741.84-020348.4_1.png

OT MASTER J192739.31+020014.3 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 27m 39.31s +02d 00m 14.3s on 2012-10-04.68036 UT. The OT unfiltered magnitude is 15.2m (limit 17.3m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2012-09-12 18:12:27 UT with unfiltered magnitude limit 16.0 m. There are two non star objects N0232003105668 and N023200356038 in The GSC 2.2 Catalogue with 2.4 and 3.8 arcsec offsets. There is a faint blue star (magnitude 19-20) within 1" from the position of the OT visible on POSS-II plates. There are no previous outbursts on any of 12 DSS plates. However, the star is showing variability between the Red plates taken at different epochs, and the small proper motion over the 40-year interval. The crowded field (galactic latitude -7 deg) makes the photometry and astrometry of archival plates difficult. There are two other 17-18 mag stars within 5" from the variable.

There is nothing at the position of the OT in 2MASS, 1RXS, GCVS catalogs and in AAVSO VSX. This area is not covered by SDSS, NEAT and GALEX.

Based on the blue color, proper motion and amplitude of variability we conclude that MASTER OT J192739.31+020014.3 is a new cataclysmic variable (dwarf nova) in outburst.

Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J192739+020014-BRIR5x5.jpg (5'x5' FOV). Follow up observations are desirable.

The discovery and reference images are available at: http://observ.pereplet.ru/images/OT_J192739.31+020014.jpg

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