Star cluster membership - Separating sheep from goats

Details Star cluster membership - Separating sheep from goats Star cluster membership - Separating sheep from goats

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981s%26t....62..112m&link_type=abstract

Sky and Telescope, vol. 62, Aug. 1981, p. 112-115.

Astronomy and Astrophysics

Astronomy

Astrometry, Star Clusters, Stellar Evolution, Stellar Motions, Computer Techniques, Hertzsprung-Russell Diagram, Open Clusters, Star Distribution, Stellar Luminosity, Stellar Mass, White Dwarf Stars

Scientific paper

The paper examines recent improvements on measurements of proper motions of stars, and the resulting refinement of the current knowledge of star cluster members. Comparing clusters in color-magnitude diagrams for evolutionary studies and the problem of defining cluster members are discussed. Astrometry is evaluated as a solution, where photographs taken at different times are compared for varying motions, with true members shifting in unison. Using high-speed computers high-quality proper motions can be derived from large-scale plates. Proper motion criteria found by using automated devices measuring positions of stars on plates are also used to recognize white dwarfs in open clusters, and may help astrometry become a more active field in astronomy.

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