Abstract
DK Cyg (P=0.4707) is a contact binary system that undergoes complete eclipses. All the published photoelectric data have been collected and utilized to reexamine and update the period behavior of the system. A significant period increase with rate of 12.590 × 10−11 days/cycle was calculated. New period and ephemeris have been calculated for the system. A long term photometric solution study was performed and a light curve elements were calculated. We investigated the evolutionary status of the system using theoretical evolutionary models.
Highlights
The eclipsing binary DK Cyg (BD +330 4304, 10.37–10.93 mv) is a well known contact binary system with a period of about 0.4707 days
The system DK Cyg was classified in the General Catalogue of Variable Stars as A7V [7], while Binnendijk [6] adopted it as A2
Mochnacki and Doughty [8] showed that the color index of the system judged its spectral type and found that the spectral type of the system is more likely to be about F0 to F2
Summary
The eclipsing binary DK Cyg (BD +330 4304, 10.37–10.93 mv) is a well known contact binary system with a period of about 0.4707 days. It was discovered as variable star earlier by Guthnick and Prager [1], so their epoch of intensive observations is very long. Rucinski and Lu [2] carried out the first spectroscopic observations and estimated the mass ratio as q = 0.325 and classified the system as an A-subtype contact system with spectral type of A8V. Four complete light curves by Binnendijk [6], Paparo et al [10], Awadalla [9], and Baran et al [11] are published. The structures of the paper are as follows: Section 2 deals with the period change, Section 3 is devoted to the light curve modeling, and Section 4 presents the discussion and conclusion reached
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