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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
| CCD photometry in the Vilnius photometric systems. II - Analysis of a region in Lyra
Two-dimensional classification of 216 stars down to 17 mag based ontheir seven color photoelectric and CCD photometry in the Vilnius systemis presented. Except for the normal stars, several subdwarfs,metal-deficient giants, and stars of other peculiarities are suspected.Interstellar extinction is determined for normal stars in two areasnorth and south of globular cluster M56, as well as for a 1 sq deg areaaround M56. The mean value of A(v) outside the galactic dust layer isabout 0.75 mag.
| Photoelectric Photometry of Stars in the Vilnius System in the Direction of Globular Cluster M56
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Группы:
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Наблюдательные данные и астрометрия
| Созвездие: | Лира |
| Прямое восхождение: | 19h14m21.07s |
| Склонение: | +30°21'03.2" |
| Видимая звёздная величина: | 7.823 |
| Расстояние: | 386.1 парсек |
| Собственное движение RA: | 3 |
| Собственное движение Dec: | 3.4 |
| B-T magnitude: | 7.858 |
| V-T magnitude: | 7.826 |
Каталоги и обозначения:
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