The infrared emission from dust surrounding newly formed O stars
| العنوان: | The infrared emission from dust surrounding newly formed O stars |
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| المؤلفون: | M. G. Wolfire, Douglas O. S. Wood, Ed Churchwell |
| المصدر: | The Astrophysical Journal. 354:247 |
| بيانات النشر: | American Astronomical Society, 1990. |
| سنة النشر: | 1990 |
| مصطلحات موضوعية: | Physics, H II region, Star formation, Molecular cloud, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Abundance of the chemical elements, Interstellar medium, Space and Planetary Science, Astrophysics::Solar and Stellar Astrophysics, Circumstellar dust, Protostar, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Cosmic dust |
| الوصف: | The dust cocoon around a newly formed 06 ZAMS star embedded in its natal molecular cloud is modeled for a wide range of radial density distribution and grain properties. The most important result of this investigation is that the only models that satisfy all the observational constraints require thin dust shells with relatively large inner radii composed of grains with about one-half the graphite/silicate abundance ratio of the MRN-DL mixture for the diffuse interstellar medium. It is also shown that constant density models produce the best overall fit to the observations; the dust cocoons are optically thick at wavelengths shortward of approximately 7 microns, and the warm dust cocoons are large; the average dust temperatures drop very steeply just outside the inner boundary of the dust shell to less than 100 K in less than 0.1 percent of the outer shell radius; the addition of water ice mantles to refractory grain cores produces a strong 3.07 micron absorption feature and weaker 12 and 45 micron absorption features; and all models imply rather massive dust shells. 37 refs. |
| تدمد: | 1538-4357 0004-637X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::9d572580b35b2069412fce4f7b78acf6 https://doi.org/10.1086/168685 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........9d572580b35b2069412fce4f7b78acf6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15384357 0004637X |
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