Two new CVs detected by MASTER

ATel #4639; V. Echeistov, P. Balanutsa, P. Podvorotny, D. Denisenko, V. Lipunov, E. Gorbovskoy, V. Lipunov, N. Tiurina, 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 11 Dec 2012; 16:24 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J072508.30+115522.2 - CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 07h 25m 08.30s +11d 55m 22.2s on 2012-12-09.75646 UT. The OT unfiltered magnitude is 16.5m (limit 17.7m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-03-26.51595 UT with unfiltered magnitude limit 18.9m.

This object was in outburst on the blue POSS-II plate taken on 1996 Nov. 13 but at quiescence on 7 other plates. It is present in GSC 2.3.2 with the following coordinates (J2000.0): 07 25 08.328 +11 55 21.80 and jmag=17.26. Comparison of 1996 and 1998 blue plates is posted at http://master.sai.msu.ru/static/OT/J072508+115522-DSS-Blue.jpg (3'x3' FOV). The faint star (m~21.5) is visible near the limit of 1955 Mar. 22 and 1998 Jan. 27 blue plates.

There is nothing at this position in 2MASS, USNO-B1.0, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, CRTS and GALEX. No additional outbursts were detected on 91 Palomar/NEAT images obtained on 29 different nights from 2000 Nov. 21 to 2002 Mar. 19. Based on presence of the previous outburst in 1996 and amplitude of variability we conclude that MASTER OT J072508.30+115522.2 is a new cataclysmic variable (dwarf nova).

Follow up observations are encouraged.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/072508.30115522.2.png

MASTER OT J062313.55+315350.6 - New CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 23m 13.55s +31d 53m 50.6s on 2012-12-10.65594 UT. The OT unfiltered magnitude is 17.6m (limit 18.2m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-10-20.77925 UT with unfiltered magnitude limit 19.0m.

This object was in outburst on red POSS-II plate taken on 1989 Nov. 08 but at quiescence on 11 other plates. It is present in GSC 2.3.2 with the following coordinates (J2000.0): 06 23 13.441 +31 53 49.94 and Fmag=17.26.

There is nothing at this position in 2MASS, USNO-B1.0, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, CRTS and GALEX. No additional outbursts were detected on 48 Palomar/NEAT images obtained on 14 different nights from 2001 Oct. 04 to 2003 Jan. 14. Based on presence of the previous outburst in 1989 and amplitude of variability we conclude that MASTER OT J062313.55+315350.6 is a new cataclysmic variable (dwarf nova). Follow up observations are encouraged.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/062313.55315350.6.png

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