Received: 15.08.2007; accepted: 11.10.2007
(E-mail for contact: firstname.lastname@example.org)
1. X-ray source 1RXS J022526.9+304205.
2. Probably can be identified with the X-ray source 1RXS J045638.6+434820 (in 29"). B-V = 1.410 (Tycho2), J-K = 0.797 (2MASS). Types SR or CEP are not excluded. The ROTSE data with photometric correction flags (usually rejected) were kept for the analysis. The use of these data considerably increases the number of available observations without deteriorating quality and allows us to determine the period more accurately.
3. X-ray source 1RXS J142509.3+391953.
4. X-ray source 1RXS J143241.5+461132. Period P=1.1708d is not excluded.
5. X-ray source RX J1539.3+4745.
6. X-ray source 1WGA J1557.7+4123.
7. X-ray source 1RXS J160650.2+411729.
8. X-ray source 1RXS J174718.8+513310.
I present the discovery of 8 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.
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436