The nature of the Yale Common Proper Motion groups of stars

Details The nature of the Yale Common Proper Motion groups of stars The nature of the Yale Common Proper Motion groups of stars

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1367l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, Sept. 1983, p. 1367-1375.

Astronomy and Astrophysics

Astronomy

3

Southern Sky, Star Clusters, Stellar Color, Stellar Magnitude, Stellar Motions, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Spectra, Ubv Spectra

Scientific paper

Attention is given to a large group of approximately 90 stars, two groups of 20-30 stars, and 12 groups of a few stars each, taken from DDO system image tube spectral classification and intermediate band photometry for the Yale Common Proper Motion groups of 180 southern stars. Spectroscopic and photometric analyses of these groups have indicated a very scattered Pop I main sequence in their color-magnitude diagrams. Distance moduli of 5 or less were derived from the average spectroscopic parallaxes, in keeping with the proper motion amplitude of 0.1 arcsec/year. The main sequence of each group shows scatter when plotted in an HR diagram, indicating that they are probably not homogeneous groups of stars sharing common physical origins.

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