Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43...37b&link_type=abstract
Astronomy and Astrophysics, vol. 43, no. 1, Sept. 1975, p. 37-44.
Astronomy and Astrophysics
Astrophysics
44
Astronomical Photometry, Interstellar Extinction, Open Clusters, Dispersion, Material Absorption, Star Distribution, Stellar Evolution, Stellar Rotation
Scientific paper
The importance of nonuniform extinction in open star clusters of intermediate age is studied on the basis of photoelectric UBV measurements in open clusters catalogued by Mermilliod (1975) and of Wallenquist's study (1975) of the presence of absorbing matter by star counts in the fields of open clusters. It is found that clusters having less uniform projected stellar density on the sky are also those which present the largest dispersion in the two-color diagram. The major causes of dispersion in the photometric sequences are discussed and it is shown that the differential extinction is important not only in the case of very young clusters, but also in some clusters older than 50 million years. The effects of stellar rotation, stellar duplicity, and the limited precision of the measures can explain the observed dispersion in the least reddened clusters.
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