[vsnet-chat 7513] Two New Eclipsing Variable Stars in the Field of RXJ2133: VSX J213321.5+510857 and VSX J213320.0+510819

[Ivan Andronov]

TWO NEW ECLIPSING VARIABLE STARS IN THE FIELD OF RX J2133:  VSX J213321.5+510857 AND VSX J213320.0+510819

NATALIA A. VIRNINA 1,2, IVAN L. ANDRONOV 2, PAVOL A. DUBOVSKY 3, IGOR KUDZEJ 3

1)	Odessa National University, Odessa, Ukraine, virnina at gmail.com 
2)	Odessa National Maritime University, Odessa, Ukraine, il-a at mail.ru  
3)	Vihorlat Observatory, Humenné, Slovakia, var at kozmos.sk, vihorlatobs1 at stonline.sk 


Abstract:   Two new eclipsing variable stars USNO-B1.0 1411-0397871 and USNO-B1.0 1411-0397855 were discovered in the 9.4'x9.4' field of 1RXS J213344.1+510725 = RX J2133 which had been observed using the 1-meter Vihorlat National Telescope in the Astronomical Observatory on Kolonica Saddle and got names "Kol 7" and "Kol 8" for the new variables discovered in Kolonica. 
We preliminary registered these stars in the VSX (http://vsx.aavso.org/) and they got names VSX J213321.5+510857 and VSX J213320.0+510819, respectively.
 Types of variability were determined as EW for both stars. For the statistical modeling, the program FDCN (Andronov, 1994, http://il-a.pochta.ru/OAP7_49.pdf ) was used, which allowed to determine degrees of the statistically optimal trigonometric polynomials and all photometric parameters, which are needed for the General Catalogue of Variable Stars, with their corresponding errors.

The Tab presents all the parameters needed for the GCVS for these two newly discovered variables.

Parameters	Kol7	Kol8
Initial epoch (HJD)	2455084.1995±0.0005	2455083.7550±0.0023
Period (d)	0.371782±0.000006	0.91503±0.00015
m min I (R)	15.935±0.005	17.268±0.012
m min II (R)	15.887±0.003	17.210±0.006
m max (R)	15.633±0.003	16.784±0.007
S                     4                              4

Another possible solution for Kol8 is T0=2455083.5781±0.0013, P=0.92529±0.00004. In this case, the phase light curve is not covered completely, only one minimum is visible. 

Acknowledgements:
The authors are thankful to Dr. Zdeněk Mikulášek for helpful discussion.  

The complete paper was submitted to the "Open European Journal on Variable Stars" 
http://var.astro.cz/oejv/