Abstract
view Abstract Citations (13) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Star formation and galactic evolution. I. General expressions and applications to our Galaxy. Kaufman, M. Abstract Useful analytic approximations of star formation and galactic evolution including the birthrate per unit mass are obtained by treating the efficiencies of the mechanisms of galactic evolution as time independent. These mechanisms for triggering star formation in interstellar clouds involve: (1) star formation triggered by a galactic spiral density wave, (2) star formation by shock waves from supernovae, and (3) star formation by an expanding H II region. In situations where shock waves from high-mass stars are the only important star-forming mechanisms, the birthrate is exponential in time; this case is appropriate for the past evolution of an elliptical galaxy, nuclear bulge, or galactic halo. In the disk of a spiral galaxy where all three mechanisms operate, the birthrate consists of an exponential term plus a time-independent term. For our Galaxy, this simplified model is used to compute the radial distributions of young objects and low-mass stars in the disk, and the past and present birthrates in the solar-neighborhood shell. Publication: The Astrophysical Journal Pub Date: September 1979 DOI: 10.1086/157330 Bibcode: 1979ApJ...232..707K Keywords: Astronomical Models; Galactic Evolution; Milky Way Galaxy; Star Distribution; Star Formation; Supernovae; Chronology; Galactic Bulge; H Ii Regions; Radial Distribution; Stellar Structure; Astrophysics; Galaxy:Star Formation; Interstellar Clouds:Star Formation; Shock Waves:Star Formation full text sources ADS |
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