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Absolute proper motions of open clusters. I. Observational data
Mean proper motions and parallaxes of 205 open clusters were determinedfrom their member stars found in the Hipparcos Catalogue. 360 clusterswere searched for possible members, excluding nearby clusters withdistances D < 200 pc. Members were selected using ground basedinformation (photometry, radial velocity, proper motion, distance fromthe cluster centre) and information provided by Hipparcos (propermotion, parallax). Altogether 630 certain and 100 possible members werefound. A comparison of the Hipparcos parallaxes with photometricdistances of open clusters shows good agreement. The Hipparcos dataconfirm or reject the membership of several Cepheids in the studiedclusters. Tables 1 and 2 are only available in electronic form at theCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
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| Radial velocity measurements. IV - Ground-based accompaniment to the HIPPARCOS observation program
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| Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.
| Untersuchung der offenen Sternhaufen IC 4665, NGC 6633, IC 4756
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Datos observacionales y astrométricos
| Constelación: | Serpiente |
| Ascensión Recta: | 18h38m54.95s |
| Declinación: | +06°16'14.8" |
| Magnitud Aparente: | 7.137 |
| Distancia: | 190.476 parsecs |
| Movimiento Propio en Ascensión Recta: | 3.9 |
| Movimiento Propio en Declinación: | 7.9 |
| B-T magnitude: | 7.482 |
| V-T magnitude: | 7.166 |
Catálogos y designaciones:
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