Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57.1162s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 57, Nov.-Dec. 1980, p. 1162-1173.) Soviet Astronomy, vol. 24, Nov.-Dec. 1980, p. 670-677. Trans
Astronomy and Astrophysics
Astronomy
11
Electrophotometry, Hertzsprung-Russell Diagram, Molecular Clouds, Orion Nebula, Star Clusters, Star Formation, Main Sequence Stars, Open Clusters, Spectrograms, Stellar Spectra
Scientific paper
A comparison is made among the H-R diagrams of the open clusters Cr 69 and Cr 70 as well as the NGC 1976, NGC 2024, and M78 clusters in the star formation region 1 Orionis. The clusters Cr 69, Cr 70, NGC 2024, and M78, as well as the NGC 1976 cluster, together with the stars and T associations surrounding them and the accompanying molecular clouds make up a unified star formation region located at a mean distance of 430 pc. The total mass of the stars in the star formation region is 7000 solar masses; the corresponding final mass is 20,000 solar masses. It is suggested that the entire evolution of many stars prior to the main sequence may proceed in the interior of molecular clouds where these stars would be unobservable.
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