Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..229z&link_type=abstract
Astronomy Letters, Volume 25, Issue 4, April 1999, pp.229-242
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We carried out photoelectric UBVR observations of three eclipsing systems in the OB association Cyg OB1. The ephemerides of minima and the amplitudes of light variations in the observed bands are refined. We solve all light curves of KV Cyg and V435 Cyg by Lavrov's method and determine their photometric orbital elements. Absolute parameters of the components of KV Cyg are estimated by using standard relations between the fundamental stellar parameters. By applying the same procedure to V435 Cyg, we failed to obtain the expected parameters of its components. The light curve of V699 Cyg underwent a significant change, and the question of its interpretation remains an open question. All three variables are probable members of the OB association Cyg OB1. We obtained UBVR photometry for 78 stars in the region of the association, 41 of which belong to Cyg OB1.
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