Composition and radiative properties of grains in molecular clouds and accretion disks
We define a model of the compositon and abundances of grains and gases in molecular cloud cores and accretion disks around young stars by employing a wide range of astronomical data and theory, the composition of primitive bodies in the solar system, and solar elemental abundances. In the coldest po...
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| Published in | The Astrophysical journal Vol. 421; no. 2; p. 615 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Legacy CDMS
01.02.1994
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| Subjects | |
| Online Access | Get full text |
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| Abstract | We define a model of the compositon and abundances of grains and gases in molecular cloud cores and accretion disks around young stars by employing a wide range of astronomical data and theory, the composition of primitive bodies in the solar system, and solar elemental abundances. In the coldest portions of these objects, we propose that the major grain species include olivine (Fe, Mg, 2SiO4), orthopyroxene (Fe, Mg, SiO3), volatile and refractory organics, water ice, troilite (FeS), and metallic iron. This compositional model differs from almost all previous models of the interstellar medium (ISM) by having organics as the major condensed C species, rather than graphite; by including troilite as a major grain species; and by specifying the mineralogical composition of the condensed silicates. Using a combination of laboratory measurements of optical constants and asymptotic theory, we derive values of the real and imaginary indices of refraction of these grain species over a wavelength range that runs from the vacuum ultraviolet (UV) to the radio domain. The above information on grain properties is used to estimate the Rosseland mean opacity of the grains and their monochromatic opacity. |
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| AbstractList | We define a model of the compositon and abundances of grains and gases in molecular cloud cores and accretion disks around young stars by employing a wide range of astronomical data and theory, the composition of primitive bodies in the solar system, and solar elemental abundances. In the coldest portions of these objects, we propose that the major grain species include olivine (Fe, Mg, 2SiO4), orthopyroxene (Fe, Mg, SiO3), volatile and refractory organics, water ice, troilite (FeS), and metallic iron. This compositional model differs from almost all previous models of the interstellar medium (ISM) by having organics as the major condensed C species, rather than graphite; by including troilite as a major grain species; and by specifying the mineralogical composition of the condensed silicates. Using a combination of laboratory measurements of optical constants and asymptotic theory, we derive values of the real and imaginary indices of refraction of these grain species over a wavelength range that runs from the vacuum ultraviolet (UV) to the radio domain. The above information on grain properties is used to estimate the Rosseland mean opacity of the grains and their monochromatic opacity. |
| Audience | PUBLIC |
| Author | Fong, Wesley Simonelli, Damon P. Beckwith, Steven Hollenbach, David Pollack, James B. Roush, Ted |
| Author_xml | – sequence: 1 givenname: James B. surname: Pollack fullname: Pollack, James B. organization: NASA Ames Research Center – sequence: 2 givenname: David surname: Hollenbach fullname: Hollenbach, David organization: NASA Ames Research Center – sequence: 3 givenname: Steven surname: Beckwith fullname: Beckwith, Steven organization: Max-Planck-Institut fuer Astronomie – sequence: 4 givenname: Damon P. surname: Simonelli fullname: Simonelli, Damon P. organization: Cornell Univ – sequence: 5 givenname: Ted surname: Roush fullname: Roush, Ted organization: NASA Ames Research Center – sequence: 6 givenname: Wesley surname: Fong fullname: Fong, Wesley organization: Synernet, Fremont, CA |
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| Snippet | We define a model of the compositon and abundances of grains and gases in molecular cloud cores and accretion disks around young stars by employing a wide... |
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| StartPage | 615 |
| SubjectTerms | Astrophysics |
| Title | Composition and radiative properties of grains in molecular clouds and accretion disks |
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| Volume | 421 |
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