The structure of star formation regions. III - Individual regions - Spatial extent, mass, and age of SFR Sagittarius I

Details The structure of star formation regions. III - Individual regions - Spatial extent, mass, and age of SFR Sagittarius I The structure of star formation regions. III - Individual regions - Spatial extent, mass, and age of SFR Sagittarius I

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981azh....58...45s&link_type=abstract

(Astronomicheskii Zhurnal, vol. 58, Jan.-Feb. 1981, p. 45-57.) Soviet Astronomy, vol. 25, Jan.-Feb. 1981, p. 25-32. Translation

Astronomy and Astrophysics

Astronomy

5

Hertzsprung-Russell Diagram, Sagittarius Constellation, Star Formation, Stellar Mass, Stellar Structure, Chronology, Electrophotometry, Molecular Clouds, Spatial Distribution, Star Clusters

Scientific paper

Photoelectric UBV photometry was used to study selected stars in the clusters NGC 6530, 6531, 6611, 6613 and near the nebulae M17 and M20. These clusters as well as Bo 14, NGC 6544, 6546, 6595, 6604, Cr 367 and Cr 469, along with field stars in the region and the molecular cloud common to all the objects, make up the unified star formation region Sgr I. Distended along the galactic plane, this region measures 900 x 140 pc. Its stars have a combined mass of about 100,000 solar masses; the mass of the molecular cloud is 10 million to 40 million solar masses. Thirteen Cepheids occur in the region; CR Ser and X Sct are about 50 million years old. The age of the oldest clusters in the region is 20 million to 30 million years old; Sgr I itself is more than 100 million years old.

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