Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..717k&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 717-723.
Astronomy and Astrophysics
Astrophysics
5
Galactic Evolution, Milky Way Galaxy, Star Formation, Density Wave Model, H Ii Regions, Spatial Distribution, Spiral Galaxies, Stellar Evolution
Scientific paper
A method is presented for using the observed distribution of H II regions in a spiral galaxy to calculate the percentage of young stars formed by the spiral density wave. In the disk of our Galaxy, star formation by high-mass stars is responsible for at least 40% of the high-mass stars, and is likely to account for 60% of the star births. The value of the time constant T describing the efficiency of star formations by high-mass stars and the UBV colors in normal elliptical galaxies imply that the average past value of T is less than or equal to 10 to the 9th yr. Thus a similar range of values for the efficiency of star formation of high-mass stars may apply both to the present disk of our Galaxy and to the average past evolution of elliptical galaxies.
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