Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l.105c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 15, 1979, p. L105, L106. NSF-supported research.
Astronomy and Astrophysics
Astronomy
20
Protostars, Star Clusters, Star Formation, Emission Spectra, Hertzsprung-Russell Diagram, Infrared Astronomy, Light Curve, Optical Emission Spectroscopy
Scientific paper
The main conclusions of a large-scale study of star formation based on optical spectroscopy and IR observations of several hundred young stars are presented. The data have been interpreted by means of H-R diagrams for five large stellar aggregates, including the Taurus-Auriga complex, as well as convective-radiative tracks, isochrones, and lines of constant stellar radius. It is found that: (1) the distribution of stars in the more extensive H-R diagrams is highly suggestive of convective-radiative evolution; (2) many of the stars lie on their convective tracks; (3) extinction probably occurs within the dark clouds rather than in circumstellar envelopes; (4) the visible stars in the Taurus-Auriga clouds seem to have formed in the surface layers of the clouds; (5) the overall efficiency of star formation is a few percent for either entire aggregates or smaller entities; (6) there is no evidence for coeval star formation; and (7) the source of the principal stellar emission lines is apparently chromospheric.
Cohen Martin
Kuhi Leonard V.
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