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- W2117001569 abstract "view Abstract Citations (11) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Dust, Radiation Pressure, and Star Formation. Harwit, Martin Abstract Spitzer (1941) has shown that radiation can produce inverse-square4aw attractive forces between absorbing interstellar grains. Whipple (1946) and Savedoff (1955) examined whether these forces could cause dust to flow through ambient gas and form dense clouds from which stars would form Savedoff concluded that appreciable concentration of dust was not to be expected and that radiative effects would be small, partly because grains have a high albedo. The present paper re-examines the problem by considering (1) that instability analogous to gravitational instability can be produced by radiation and (2) that, in the neighborhood of hot stars, grains are subjected to high-intensity, near ultraviolet irradiation for which the albedo probably is low. On this assumption the minimum mass of a cloud that becomes unstable at the center of an 0 association can be estimated. It is suggested that 0 clusters are formed in this manner. The process is of comparable efficiency to Oort's (1955) suggested compression by H ii regions and, moreover, does not entail partial destruction of the cloud through ultraviolet ionixation Spitxer's radiative attraction does not appear to play a role with the free radical grains described by Platt (1957), since these grains effectively scatter but do not absorb radiation. They may, however, be subject to scattering pressures. A laboratory experiment to detect the radiative instability is proposed. It is shown that, near hot stars, radiation pressures can accelerate clouds to speeds comparable with the velocity of interstellar clouds and of stellar associations. Radiation pressures could also account for outflow of gas from galactic nuclei. Publication: The Astrophysical Journal Pub Date: November 1962 DOI: 10.1086/147440 Bibcode: 1962ApJ...136..832H full text sources ADS |" @default.
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- W2117001569 date "1962-11-01" @default.
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- W2117001569 title "Dust, Radiation Pressure, and Star Formation." @default.
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