skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dust properties around evolved stars from far-infrared size limits

Abstract

High angular resolution far-infrared scans were obtained of six stars surrounded by circumstellar dust shells believed to result from mass loss by the central star. None of the dust shells was clearly resolved at either 50 or 100 microns; the upper limits are in the range 4 to 10 arcsec. These size limits place constraints on the far-IR dust emissivity and dust density distribution. For one of the objects, AFGL 2343, larger than normal grains are almost certainly required. For several other stars, the size limits are much more consistent with dust having an emissivity law no steeper than 1/lambda in the 1-100-micron spectral region. For IRC + 10216, an earlier suggestion is confirmed that, assuming reasonable grain properties, a smooth radial dust distribution is not consistent with the scans and the energy distribution of the object. 29 refs.

Authors:
; ; ;  [1]
  1. Texas Univ., Austin (USA) Grenoble Observatoire, Saint-Martin-d'Heres (France) Joint Astronomy Center, Hilo, HI (USA) NASA, Marshall Space Flight Center, Huntsville, AL (USA)
Publication Date:
OSTI Identifier:
5867866
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal; (USA)
Additional Journal Information:
Journal Volume: 368; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; STARS; COSMIC DUST; FAR INFRARED RADIATION; DENSITY; ENERGY SPECTRA; INFRARED RADIATION; LIMITING VALUES; MASS TRANSFER; RESOLUTION; SPATIAL DISTRIBUTION; STAR EVOLUTION; DISTRIBUTION; DUSTS; ELECTROMAGNETIC RADIATION; PHYSICAL PROPERTIES; RADIATIONS; SPECTRA; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources

Citation Formats

Harvey, P M, Lester, D F, Brock, D, and Joy, M. Dust properties around evolved stars from far-infrared size limits. United States: N. p., 1991. Web. doi:10.1086/169719.
Harvey, P M, Lester, D F, Brock, D, & Joy, M. Dust properties around evolved stars from far-infrared size limits. United States. https://doi.org/10.1086/169719
Harvey, P M, Lester, D F, Brock, D, and Joy, M. 1991. "Dust properties around evolved stars from far-infrared size limits". United States. https://doi.org/10.1086/169719.
@article{osti_5867866,
title = {Dust properties around evolved stars from far-infrared size limits},
author = {Harvey, P M and Lester, D F and Brock, D and Joy, M},
abstractNote = {High angular resolution far-infrared scans were obtained of six stars surrounded by circumstellar dust shells believed to result from mass loss by the central star. None of the dust shells was clearly resolved at either 50 or 100 microns; the upper limits are in the range 4 to 10 arcsec. These size limits place constraints on the far-IR dust emissivity and dust density distribution. For one of the objects, AFGL 2343, larger than normal grains are almost certainly required. For several other stars, the size limits are much more consistent with dust having an emissivity law no steeper than 1/lambda in the 1-100-micron spectral region. For IRC + 10216, an earlier suggestion is confirmed that, assuming reasonable grain properties, a smooth radial dust distribution is not consistent with the scans and the energy distribution of the object. 29 refs.},
doi = {10.1086/169719},
url = {https://www.osti.gov/biblio/5867866}, journal = {Astrophysical Journal; (USA)},
issn = {0004-637X},
number = ,
volume = 368,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 1991},
month = {Fri Feb 01 00:00:00 EST 1991}
}