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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
| Third preliminary catalogue of stars observed with the photoelectric astrolabe of the Beijing Astronomical Observatory.
Not Available
| Radial velocity measurements. I - Ground-based observations of the program stars for the HIPPARCOS satellite
The radial velocities of 272 stars brighter than m(pg) = 8.5 aredetermined by digital microphotometric measurement of plates obtainedwith dispersion 80 A/mm using the Marly slit spectrograph on the 120-cmtelescope of the Observatoire de Haute Provence. The objects wereselected as probable members of the input catalog for the ESA Hipparcosastrometric satellite. The measurement techniques and data-reductionprocedures are described in detail, and the results are presented inextensive tables and graphs and briefly characterized.
| The magnesium method for determining the electron density in stellar atmospheres
A method for determining the electron density in stellar atmospheres byusing the ultraviolet resonance lines of neutral and ionized magnesium,2852-A Mg I and 2795-A Mg II, is briefly described. The mean electrondensities in the atmospheres of 31 type A0-G5 stars as well as the sun,which have been determined by using equivalent widths of the 2852-A and2795-A lines recorded in experiments on the Orion 2, IUE, and otherspacecraft, are presented.
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | עגלון |
| התרוממות ימנית: | 05h04m16.19s |
| סירוב: | +45°46'45.7" |
| גודל גלוי: | 6.519 |
| מרחק: | 57.078 פארסק |
| תנועה נכונה: | 18.4 |
| תנועה נכונה: | -60.5 |
| B-T magnitude: | 6.775 |
| V-T magnitude: | 6.541 |
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