Submillimeter observations of evolved stars
Broad-band submillimeter observations of the thermal emission from evolved stars have been obtained with the United Kingdom Infrared Telescope on Mauna Kea, Hawaii. These observations, at an effective wavelength of 400 ..mu..m, provide the most direct method for estimating the mass loss rate in dust from these stars and also help to define the long-wavelength thermal spectrum of the dust envelopes. The mass loss rates in dust that we derive range from 10/sup -9/ to 10/sup -6/ M/sub sun/ yr/sup -1/ and are compared with mass loss rates derived from molecular line observations to estimate gas-to-dust ratios in outflowing envelopes. These values are found to be generally compatible with the interstellar gas-to-dust ratio of approx.100 if submillimeter emissivities appropriate to amorphous grain structures are assumed. Our analysis of the spectrum of IRC+10216 confirms previous suggestions that the grain emissivity varies as lambda/sup -1.2/ rather than as lambda/sup -2/ for 10
- Research Organization:
- University of Maryland and Catonsville Community College
- OSTI ID:
- 5308697
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 294:1; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
COSMIC DUST
COSMIC GASES
DUSTS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSIVITY
FLUIDS
GASES
INFRARED RADIATION
INTERSTELLAR GRAINS
MASS TRANSFER
NONMETALS
OPTICAL PROPERTIES
OXYGEN
OXYGEN COMPOUNDS
PARTICLES
PHYSICAL PROPERTIES
RADIATIONS
SILICATES
SILICON COMPOUNDS
STAR EVOLUTION
STARS
SURFACE PROPERTIES