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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
| BV(RI)_KC_ CCD photometry of the core of the young open cluster, NGC 5460.
We present CCD photometry on the BV(RI)_KC_ (Cape) photometric system ofthe core of the young open cluster, NGC 5460, to a magnitude limitV=~19, R=~19.5. We give photometry for 353 stars and identify 25 ascluster members along with a further 27 as possible members based ontheir positions in individual colour-magnitude diagrams. We estimate thereddening to the cluster and redefine its distance and age. Four starsare identified as possible variables and their nature discussed.
| Further observations of stars in the open cluster NGC 5460
New photoelectric UBV photometry in the open cluster NGC 5460 ispresented for 155 stars brighter than 14.0 mag. In addition, sixcomparatively bright red stars in the cluster field were observed in theDDO and Washington systems. Nearly 40 percent of the observed stars arefound to be members or probable members. The analysis of the new datayields E(B-V) = 0.12 +/- 0.03 and V(0) - M(v) = 9.34 +/- 0.20 (740 +/-68 pc) for the cluster reddening and true distance modulus,respectively. An age of 1.1 x 10 exp 8 yr was derived, which places thiscluster within the NGC 2516 age group. NGC 5460 does not probablycontain any red giant.
| 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.
| The local system of early type stars - Spatial extent and kinematics
Published uvby and H-beta photometric data and proper motions arecompiled and analyzed to characterize the structure and kinematics ofthe bright early-type O-A0 stars in the solar vicinity, with a focus onthe Gould belt. The selection and calibration techniques are explained,and the data are presented in extensive tables and graphs and discussedin detail. The Gould belt stars of age less than 20 Myr are shown togive belt inclination 19 deg to the Galactic plane and node-lineorientation in the direction of Galactic rotation, while the symmetricaldistribution about the Galactic plane and kinematic properties (purecircular differential rotation) of the belt stars over 60 Myr oldresemble those of fainter nonbelt stars of all ages. The unresolveddiscrepancy between the expansion observed in the youngest nearby starsand the predictions of simple models of expansion from a point isattributed to the inhomogeneous distribution of interstellar matter.
| Four-colour and H-beta photometry for early type stars in three southern galactic regions
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...41...85L&db_key=AST
| Photometric study of the galactic cluster NGC 5460.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971AJ.....76..639C&db_key=AST
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