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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
| UVBY photometry in M39 and Delta Lyrae
Photoelectric uvby observations have been obtained for stars in themid-B to early-A spectral range in the fields of M39 and Delta Lyrae.The color and luminosity calibrations of Crawford for B, A, and F starshave been employed, as well as the new calibration for A0 stars ofHilditch et al. (1983). The resulting distance modulus for M39 is 7.23,with a mean E(b - y) color excess of 0.025. A distance modulus of 7.29and a mean reddening of 0.032 has been derived for ten stars in thefield of Delta Lyrae, but the existence of a cluster is not stronglyindicated in the present study. Comparison of photometric and rotationalvelocity data for the M39 stars confirms a correlation between deltac(0) and rotational velocity for A and A0 stars, and suggests that anevolutionary correction of only -3 delta c(0) be employed for stars inboth spectral classes.
| Concentrations in the Local Association - Part Two - the Northern Concentrations Including the Alpha-Persei Pleiades M34 and Delta-Lyrae Clusters
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983MNRAS.204..391E&db_key=AST
| NGC 2516 and the Pleiades Group
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972ApJ...173...63E&db_key=AST
| A Possible New Galactic Cluster Involving δ Lyrae
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Datos observacionales y astrométricos
| Constelación: | Lira |
| Ascensión Recta: | 18h55m09.31s |
| Declinación: | +36°44'30.1" |
| Magnitud Aparente: | 7.919 |
| Distancia: | 294.118 parsecs |
| Movimiento Propio en Ascensión Recta: | -2.4 |
| Movimiento Propio en Declinación: | -3.8 |
| B-T magnitude: | 7.939 |
| V-T magnitude: | 7.921 |
Catálogos y designaciones:
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