Hipparcos open clusters and stellar evolution
نویسندگان
چکیده
منابع مشابه
Open clusters with Hipparcos ?
New memberships, mean parallaxes and proper motions of all 9 open clusters closer than 300 pc (except the Hyades) and 9 rich clusters between 300 and 500 pc have been computed using Hipparcos data. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to 0.5 mas/yr for proper motions, are of great interest for calibrating photometric parallaxes as well as for kinematical studies. Caref...
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Hipparcos observations of open clusters provide mean cluster parallax determinations with an unprecedented accuracy. Possible biases in the Hipparcos parallaxes exhibited by other authors has been analysed and proven not to exist. A comparison of observed (V; B ? V) diagrams of the Pleiades and Praesepe with theoretical isochrones has been performed. It does not exhibit disagreement with Hippar...
متن کاملHipparcos distance calibrations for 9 open clusters ?
Parallaxes have been determined for 9 nearby open clusters in order to derive a composite, age resolved, HR diagram. An age-luminosity relation was found to exist for mainsequence stars. A suggested 1 mas error in the Hipparcos parallax for the Pleiades, to explain the difference with the ground-based photometric distance estimate, seems unlikely: 5 other young open clusters examined (IC 2602, ...
متن کاملCritical tests of stellar evolution in open clusters II . Membership , duplicity , and stellar and dynamical evolution in NGC 3680 ? , ? ?
Based on new, accurate photometry, radial velocities, and proper motions for the intermediate-age open cluster NGC 3680, we identify individual single and binary cluster members and field stars in the colour-magnitude diagram (CMD). This basic step turns out to be crucial for a proper understanding of the cluster CMD: ∼60% of the stars are found to be field stars, and over 50% of the cluster st...
متن کاملEarly Evolution of Stellar Clusters
Observations have revealed that most stars are born in clusters. These systems, containing from tens to thousands of stars and typically significant mass in gas in the youngest systems, evolve due to a combination of stellar and star-gas interactions. Simulations of pure stellar systems are used to investigate possible initial configurations including ellipticity, substructure and mass segregat...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2002
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2002.05508.x