Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98...71l&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 71-73.
Astronomy and Astrophysics
Astrophysics
1
Galactic Structure, Milky Way Galaxy, Star Clusters, Star Distribution, Stellar Evolution, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Open Clusters
Scientific paper
The photometric properties of stars belonging to numerous loose stellar clusterings in the Southern Milky Way are examined in an attempt to find typical ages and structures for the clusterings. UBV photometry was obtained for almost 2000 stars in 50 regions containing 100 candidate clusterings, and color-magnitude diagrams from all the fields were superimposed under the assumption that clustering members tend to form a more or less distinct pattern. The resulting diagram suggests the presence of a main sequence and possibly a giant branch, as well as a Hertzsprung gap, with a large scattering due to the presence of a large number of stars not belonging to the relevant clusterings. A V frequency diagram of the relevant clustering members indicates a typical age of approximately 150 million years, with a range from 50 million to 200 million years. An absence of any significant extension of the main sequence towards fainter stars is also noted. It is concluded that the loose clusterings are real groupings, the majority of which tend to behave as ordinary open clusters of medium age.
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