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Close binary systems in regions of OB-associations. III. V443 Cygni in Cyg OB9
The first UBVR photoelectric observations for the eclipsing variablestar V433 Cyg are carried out at the Maidanak Observatory in Uzbekistan.A new ephemeris of the binary (MinI HJD2452115.2316(38) +1.66220545(43)ċE) is derived. A new period is twice as large asthat determined earlier. The ephemeris harmonic term detected before isnot found. The harmonic small-amplitude osculation with a period of1.0481d for outside eclipsing phases is detected. All thelight curves of the binary are solved by Lavrov's direct method and theorbit photometric elements for the system are derived. The expectedabsolute basic parameters for the components of V433 Cyg are estimated:M1 = 3.2Mȯ, M2 =2.5Mȯ, R1 = 2.3Rȯ,R2 = 1.8Rȯ, M1,bol =-0.3m, M2,bol = 0.7m. We suppose thatV433 Cyg is a PMS binary at the near ZAMS and belongs to theOB-association Cyg OB9.
| UBVR photometry of the eclipsing binary star V443 Cygni
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Observation and Astrometry data
| Constellation: | はくちょう座 |
| Right ascension: | 20h27m11.46s |
| Declination: | +38°52'54.3" |
| Apparent magnitude: | 8.45 |
| Distance: | 392.157 parsecs |
| Proper motion RA: | 7.5 |
| Proper motion Dec: | 2.9 |
| B-T magnitude: | 9.89 |
| V-T magnitude: | 8.569 |
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