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Mesures de vitesses radiales. VII. Accompagnement AU sol DU programme d'observation DU satellite Hipparcos. Radial velocities. VII. Ground based measurements for Hipparcos.
We publish 734 radial velocities of stars distributed in 28 fields of4x4deg. We continue the PPO series (Fehrenbach et al. 1987; Duflot etal. 1990 and 1992), using the Fehrenbach objective prism method.
| Photometric studies of stars in the young open cluster NGC 6823
CCD and photoelectric UBV photometry are presented for 32 stars in thenuclear and coronal regions of NGC 6823 and for 13 stars in its centraltrapezium system. The stars in the inner and outer regions of thecluster exhibit a wide range in their derived color excesses, while thecomputed reddenings for the trapezium stars are found to be verysimilar. Photometric data for 36 field stars toward the clusterindicates that about 0.6 mag of absorption is due to foregroundinterstellar material. From near-IR photometry, the reddening law isfound to be uniform across the cluster and is characterized by R(V) =3.2. Using the ZAMS fitting procedure and by assuming a distance of theHyades of 3.3 mag, a mean reddening corrected distance to NGC 6823 of2.1 +/-0.1 kpc is obtained. An age range between 2 and 11 x 10 exp 6 yris found for the cluster stars. The trapezium stars are the youngest,the nuclear objects have intermediate ages, and the stars in the coronaare the oldest.
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Osservazione e dati astrometrici
| Costellazione: | Volpetta |
| Ascensione retta: | 19h40m23.76s |
| Declinazione: | +23°28'48.5" |
| Magnitudine apparente: | 7.075 |
| Distanza: | 96.618 parsec |
| Moto proprio RA: | 26.1 |
| Moto proprio Dec: | 18.9 |
| B-T magnitude: | 7.334 |
| V-T magnitude: | 7.097 |
Cataloghi e designazioni:
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