Received: 13.02.2008; accepted: 26.02.2008
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|In the NSVS data (Wozniak et al., 2004, also see http://skydot.lanl.gov/nsvs), we
noticed variability of the object NSVS 5397700 with a period and light curve
shape characteristic of RRAB stars but with a low amplitude, 0.4 mag. The
ROTSE-I position of NSVS 5397700 is between two stars, GSC 03515-01231 and GSC 03515-01748,
and it remained unclear which of them varied, with their combined
brightness apparently presented in the NSVS.
To answer this question, we estimated 119 plates of Moscow collection taken with the 40-cm astrograph in Crimea (JD2434103 - 2448892). We found that it is GSC 3515-01231 that varies. It is an RRAB star with a normal amplitude and M-m = 0.17 P. The NSVS data and our observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The coordinates are from the 2MASS catalog (Cutri et al., 2003). The magnitudes of the comparison stars are B2 magnitudes from the USNO-B1.0 catalog (Monet et al., 2003).
|Cutri, R.M., Skrutskie, M.F., Van Dyk, S. et al., 2003, 2MASS All-Sky Catalog of
Point Sources, IPAC/California Institute of Technology
Monet, D.G., Levine, S.E., Canzian, B. et al., 2003, Astron. J., 125, 984
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436