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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

New times of minimum and a period study for GO Cygni
Times of minimum derived from photometry obtained in 1963, 1967, 1978,and 1979 are presented. With these and previously published times, theperiod is studied. A constant period increase (quadratic ephemeris)represents most of the times but there was a period decrease in 1934 andpossibly in 1984. A 50-year magnetic cycle is discussed.

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Dades d'Observació i Astrometria

Constel·lació:Cygnus
Ascensió Recta:20h37m07.96s
Declinació:+36°35'02.3"
Magnitud Aparent:7.491
Distancia:169.779 parsecs
Moviment propi RA:-7.3
Moviment propi Dec:-22.9
B-T magnitude:7.589
V-T magnitude:7.5

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 196589
TYCHO-2 2000TYC 2698-1510-1
USNO-A2.0USNO-A2 1200-15464093
HIPHIP 101720

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