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Four OTs discovered by MASTER

ATel #4377; N. Tiurina, P. Balanutsa, P. Podvorotny, D. Denisenko, 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), V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 16 Sep 2012; 11:42 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

OT MASTER J215411.92+332449.0 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 21h 54m 11.92s +33d 24m 49.0s on 2012-09-15 21:01:11.802 UT. The OT unfiltered magnitude is 16.6 m (limit 19.8m).

The OT is seen in 2 images.

We have reference image without OT on 2010-11-03 17:23:43 UT with unfiltered magnitude limit 19.9 m.

There is nonstar object N2ZF013692 (rmag ~ 19.8) in The Guide Star Catalog with 5.6 arcsec offset.

Spectral observations are required.

The discovery and reference images are available at: http://observ.pereplet.ru/images/ J215411.92+332449.jpg

OT MASTER J233834.36+700148.9 - ?

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 23h 38m 34.36s +70d 01m 48.9s on 2012-09-11.72984 UT. The OT unfiltered magnitude is 18.5m (limit 19.3m).

The OT is seen in 2 image. There is no minor planet at this place. There is no objects inside 10 arcsec circle in any catalogs.

We have reference image without OT on 2011-12-26.48396 UT with unfiltered magnitude limit 19.3m.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/233834.36700148.9_1.png

MASTER J010147.00+730046.6 - new CV?

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 01h 01m 47.00s +73d 00m 46.6s on 2012-09-13.57476 UT. The OT unfiltered magnitude is 18.1m (limit 19.7m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-09-05.67766 UT with unfiltered magnitude limit 20.0m.

There is a faint blue star on the 2nd epoch Palomar plates with GSC coordinates 01 01 47.089 +73 00 46.57 and magnitudes F=20.15 and j=21.30. Nothing is present at this position in 2MASS, USNO-B1.0, GALEX and 1RXS catalogs, as well as in GCVS and AAVSO VSX. This area is not covered by SDSS and CRTS. Galactic latitude is +10.

We suggest that MASTER J010147.00+730046.6 is a new cataclysmic variable. Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/010147.00730046.6.png

MASTER J204552.23+203551.9 - new Mira variable

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 45m 52.23s +20d 35m 51.9s on 2012-09-11.87433 UT. The OT unfiltered magnitude is 12.9m (limit 17.9m).The OT is seen in 16 images. We have reference image without OT on 2010-10-26.64094 UT with unfiltered magnitude limit 20.2m.

This object is identical to the star USNO-B1.0 1105-0538952 with the large variability between 1st and 2nd epoch blue Palomar plates (B1=20.26 R1=17.07 B2=16.02 R2=17.62 I=10.89) and to the infrared source 2MASS 20455231+2035524 (J=9.79 H=9.04 K=8.58).

Archival observations of this star can be found in ASAS-3 photometry database. ASAS 204552+2035.8 Light Curve covering 7 years is showing five maxima to 13.0-13.2m with the best period 299d.

Based on the red color, amplitude of variability and the long period we conclude that MASTER J204552.23+203551.9 is a Mira variable.

The discovery and reference images are available at: http://observ.pereplet.ru/images/J204552.23+203551.jpg

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