New RS CVn Stars without Eclipses

A. V. Khruslov
Russia, Tula

Received:   8.08.2006;   accepted:   9.10.2006
(E-mail for contact: khruslov@bk.ru)

Comments:


1. The X-ray source 1RXS J050730.9+714503 is somewhat far from the variable.

2. 1RXS J065321.1+724558.

3. 1RXS J071314.2+701627. (B-V)(Tycho)=0.874.

4. 1RXS J152416.0+530806.

5. 1RXS J181928.2+365235. An eclipse (13.7m) at phase 0.35 is not excluded.

Remarks:
I present the discovery of 5 new RS CVn stars without eclipses. This classification is in agreement with the stars' relatively small amplitudes and with our identification of the stars with X-ray sources. A search for variables was carried out in the publicly available data of the Northern Sky Variability Survey (NSVS, Wozniak et al., 2004, also see http://skydot.lanl.gov/nsvs). These observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The coordinates were drawn either from the Tycho-2 or 2MASS catalogs. The ROTSE data with photometric correction flags (usually rejected) were kept for the analysis. In the cases of GSC 4350-00064 and TYC 4364 01028 1, the use of these data considerably increases the number of available observations without deteriorating quality and allows us to determine their periods more accurately.

References:
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436