Received: 25.11.2006; accepted: 28.11.2006
(E-mail for contact: firstname.lastname@example.org)
1. 1RXS J003633.1+430550. B-V = +1.23.
2. 1RXS J003712.3+441303. B-V = +0.8.
3. 1RXS J004021.5+434327. B-V = +1.2. NSVS 3784810 is a blend of two bright stars; as a result, the NSVS amplitude is small. The X-ray source is closer to the eastern component.
4. 1RXS J082713.6+412830. B-V = +1.0.
I present the discovery of four new RS CVn stars. 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 Peranso (http://users.skynet.be/fa079980/peranso/index.htm).
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436