Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.296..297p&link_type=abstract
Astrophysics and Space Science, Volume 296, Issue 1-4, pp. 297-300
Astronomy and Astrophysics
Astrophysics
Stars, Binaries, W Uma-Type Stars
Scientific paper
V2213 Cyg was discovered as a variable star by Pavlenko (1999) in 1998. We present our photometry of V2213 Cyg from 1998 2003 based on CCD observations with the K-380 Cassegrain telescope of CrAO and the 60 cm Zeiss telescope of SAI. Observations have been carried out mostly in R and sometimes in B and V Johnson system. The total amount of data is 2270 points, covering ˜50 nights. We classify this binary as a W UMa-type contact system. Using all data we determined the orbital period to be 0.350079 ± 0.000007 day. The mean brightness varies between R = 14.35 and 14.05. The mean 1999 2003 orbital light curve has two humps and a primary minimum (I), which is 0.04 mag brighter than the deeper secondary one (II). The mean humps have slightly different height. The difference between two individual maxima varies within 0.1 mag, which may indicate an activity of the components. The highest hump is an asymmetrical one: it has sort of a shoulder at phases 0.75 0.80, before entering the less deep primary minimum (phase 0.0). The system is rather reddened, its colour indices are: B-V ˜ 0.8 and V-R ˜ 0.7, and give a spectral class of V2213 Cyg earlier than K.
Litvinchova A. A.
Pavlenko Elena
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