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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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משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | ברבור |
| התרוממות ימנית: | 20h37m07.96s |
| סירוב: | +36°35'02.3" |
| גודל גלוי: | 7.491 |
| מרחק: | 169.779 פארסק |
| תנועה נכונה: | -7.3 |
| תנועה נכונה: | -22.9 |
| B-T magnitude: | 7.589 |
| V-T magnitude: | 7.5 |
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