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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
| Five-colour photometry of OB-stars in the Southern Hemisphere
Observations of OB-stars, made in 1959 and 1960 at the Leiden SouthernStation near Hartebeespoortdam, South Africa, with the VBLUW photometerattached to the 90 cm light-collector, are given in this paper. They arecompared with photometry obtained by \cite[Graham (1968),]{gra68}\cite[Walraven & Walraven (1977),]{wal77} \cite[Lub & Pel(1977)]{lub77} and \cite[Van Genderen et al. (1984).]{gen84} Formulaefor the transformation of the present observations to those of\cite[Walraven & Walraven (1977)]{wal77} and \cite[Lub & Pel(1977)]{lub77} are given. Table 4 is only available in electronic format the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) orvia http://cdsweb.u-strasbg.fr/Abstract.html
| HIPPARCOS data for two open clusters containing cepheids
Using proper motion data from the Hipparcos satellite it is shown thatthe cepheids S Nor and U Sgr are members of the open clusters NGC 6087and M 25, respectively. The precision of the Hipparcos data is needed toconclusively carry out a membership test. Parallax data, also obtainedfrom Hipparcos, do not contradict the proper motion results.
| Photoelectric search for CP2-stars in open clusters. VI - NGC 5460, NGC 6087 and IC 4725
Seventy-four stars in the clusters NGC 5460, NGC 6087, and IC 4725 whichbelong to the young to medium age range were measured photoelectricallyin the Delta a-system (Maitzen, 1976) in order to search for peculiarstars. In IC 4725, three CP2-stars were found, and two in each of theremaining clusters. Only one of them had been recognized byspectroscopy. Larger than normal seems to be the reddening correction ofthe a-values for the stars of NGC 6087. Substantial variable reddeningwas found only in IC 4725. Zero-points of V of the different publishedphotometries were compared using the authors' own photometry anddeviating objects were noted, including the Be-star HD 170682.
| Four-color and H-beta photometry of stars in the galactic cluster NGC 6087
Four-color and H beta photometry has been obtained for 16 stars in theopen cluster NGC 6087. Based on this photometry the membership of thesestars in the cluster is discussed. Using stars which appear to bemembers a color excess of E(b-y) = 0.123 m and a distance modulus of(V/0/-M/v/) = 9.60 m are derived. This distance modulus is about 0.4 mless than previous values and indicates a lower luminosity for theCepheid member, S Nor, than is currently accepted.
| The Galactic Cluster NGC 6087.
Abstract image available at:http://adsabs.harvard.edu/abs/1964ApJS....8..329L
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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Regolo |
| Ascensione retta: | 16h18m24.89s |
| Declinazione: | -57°49'33.0" |
| Magnitudine apparente: | 9.343 |
| Moto proprio RA: | -0.6 |
| Moto proprio Dec: | -2.9 |
| B-T magnitude: | 9.327 |
| V-T magnitude: | 9.342 |
Cataloghi e designazioni:
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