Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...87..119k&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 87, no. 1, Jan. 1991, p. 119-152. Research supported by Dani
Astronomy and Astrophysics
Astrophysics
60
Astronomical Photometry, Galactic Structure, Open Clusters, Stellar Evolution, Ccd Star Tracker, Color-Magnitude Diagram, Imaging Techniques, Main Sequence Stars, Ubv Spectra
Scientific paper
Distances, reddenings, and ages have been determined for 13 southern open clusters using data from CCD observations. It is shown that the photometry will become an extremely efficient and accurate technique for collecting data on clusters. The potential use of the photometry data for studies of the H-R diagram, especially the structure of the main sequence, is examined. Evidence is found for some gaps in the main sequence, and it is argued that these gaps are statistically significant. The mass functions for stars with masses of 1-6 solar are determined.
Frandsen Soeren
Kjeldsen Hans
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