Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..596b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 267, April 15, 1983, p. 596-602. Sponsorship: Consiglio Nazionale delle Ric
Astronomy and Astrophysics
Astrophysics
23
Astrophysics, Interstellar Matter, Molecular Clouds, Stellar Evolution, Flow Velocity, Main Sequence Stars, Orion Nebula, Stellar Mass, Stellar Models
Scientific paper
Using calculations of the evolution of single explosions and time-extended outflows in molecular clouds, the energy and time required to produce the high-velocity molecular outflow observed in Orion are derived for spherical expansion models. We find the energy efficiency of extended outflows is somewhat greater than that of single explosions in producing the observed velocity, radius, and mass of the outflow, but the efficiencies differ by less than a factor of 2. From the number of sources of high-velocity outflow, the present age of each outflow, and estimates of incompleteness of the detections, we estimate a rate of outflow occurrence more than 3 times greater than the formation of stars more massive than 4 Msun. We argue that low-mass stars are likely to produce the bulk of the outflowing regions in molecular clouds.
Beckwith Steve
Natta Antonella
Salpeter Edwin E.
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