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The Minima of the Eclipsing Binary System Y Cyg
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| Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm
| Prelimary Photoelectric Light Curve for DHK29=SAO 70629
The newly discovered eclipsing binary star DHK 29 = SAO 70629 has beenobserved photoelectrically from October 1992 to October 1993. With thelight curve coverage 75% complete, it is apparent that the initial1.9-day period reported in IB VS 3815 is the half-period. Three times ofprimary minima have been determined. New light elements are given.
| The S201 far-ultraviolet imaging survey. II - A field in Cygnus
Far-ultraviolet imagery of a region in Cygnus, a 20 deg diameter fieldcentered near (1950) R. A. 21 h 31.2 m decl. +37 deg 25 arcmin, wasobtained by the S201 far-ultraviolet camera during the Apollo 16mission. In a 10 minute exposure covering the 1250-1600 A wavelengthrange (effective wavelength 1400 A), 730 star images can be detected,corresponding to a limiting ultraviolet magnitude of about m (1400) =10. Assuming nominal interstellar extinction values in this region nearthe galactic plane, this result corresponds to the detection of A0 Vstars to a distance of 300 pc and of B0 V stars to 1500 pc.Uncertainties in spectral classification and interstellar extinction forindividual objects are probably more significant than calibration ormeasurement errors. Most of the objects detected are identified withstars in the Smithsonian Astrophysical Observatory Star Catalog (1966),or the Catalog of Stellar Identifications (1979) or both, but 87 objectsremain unidentified (or are identified with late-type stars).
| Y Cygni - Photometry and apsidal motion
Abstract image available at:http://adsabs.harvard.edu/abs/1980PASP...92..782G
| Photoelectric observations of CY Cygni (1959 - 1961).
Abstract image available at:http://adsabs.harvard.edu/abs/1972A&A....20..201H
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Observation and Astrometry data
| Constellation: | Schwan |
| Right ascension: | 20h53m03.49s |
| Declination: | +34°45'07.6" |
| Apparent magnitude: | 7.94 |
| Distance: | 529.101 parsecs |
| Proper motion RA: | 2.6 |
| Proper motion Dec: | -1.5 |
| B-T magnitude: | 7.867 |
| V-T magnitude: | 7.934 |
Catalogs and designations:
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