NDLI: Continuous infrared emission of proto- and young-planetary nebulae

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Continuous infrared emission of proto- and young-planetary nebulae

Content Provider	NASA Technical Reports Server (NTRS)
Author	Szczerba, Ryszard
Copyright Year	1989
Description	Evolutionary sequences of planetary nebulae (PNe) were calculated beginning from the moment of shell ejection to its dissipation and IR spectra of the outgoing radiation were obtained for different stages of the evolution. To solve the coupled hydrodynamical and radiation transfer problem a computer code was used in which gas and dust are treated as two separate hydrodynamical components. The models, which are calculated for two grain materials (graphite and silicate) have a size distribution of particles based on that found for the interstellar medium. In the computations, the recent optical properties of graphite and astronomical silicate grains tabulated by Draine (1987) were employed. It was assumed that silicate of graphite grains exist below some critical temperature equal to 1300 or to 1700 K, respectively. Infrared model spectra are compared with the IR radiation emitted by some proto- and some young-planetary nebulae. The observed IR continua can be quite well matched with our models with grains having a reasonable size range.
File Size	68749
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910005717
Archival Resource Key	ark:/13960/t39071f3r
Language	English
Publisher Date	1989-12-01
Access Restriction	Open
Subject Keyword	Astrophysics Planetary Nebulae Stellar Evolution Infrared Astronomy Silicates Infrared Spectra Stellar Models Computer Programs Cosmic Dust Emission Spectra Graphite Mathematical Models Radiative Transfer Interstellar Gas Interstellar Matter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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