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Title:
RY Scuti - Silicates around an early-type supergiant binary system
Authors:
Grasdalen, G. L.; Hackwell, J. A.; Gehrz, R. D.; McClain, D.
Affiliation:
AA(Wyoming, University, Laramie, Wyo.), AB(Wyoming, University, Laramie, Wyo.), AC(Wyoming, University, Laramie, Wyo.), AD(Wyoming, University, Laramie, Wyo.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 1, 1979, p. L129-L133. NSF-supported research. (ApJL Homepage)
Publication Date:
12/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BINARY STARS, EARLY STARS, SILICATES, STELLAR ENVELOPES, SUPERGIANT STARS, COSMIC DUST, EMISSION SPECTRA, GRAINS, INFRARED ASTRONOMY, NEAR INFRARED RADIATION, RADIO SOURCES (ASTRONOMY)
Comment:
A&AA ID. AAA026.119.050
DOI:
10.1086/183123
Bibliographic Code:
1979ApJ...234L.129G

Abstract

Near-infrared observations of the early-type (B0) supergiant binary RY Scuti clearly show that its infrared-energy distribution is dominated by emission from silicate grains. In fact RY Scuti exhibits the largest contrast yet observed for a stellar silicate excess; it is also the earliest spectral-type supergiant to exhibit dust formation. At 2.3 microns the system undergoes eclipses. This observation places a limit on the possible contribution of free-free and bound-free flux to the infrared-energy distribution. This limit is consistent with a photoionization model for the radio nebula associated with RY Scuti. Interpreting the radio nebula as being due to spherically symmetric mass outflow leads to an estimate of the mass-loss rate of 10,000 solar masses/yr. It is concluded that large density fluctuations must be present in the flow.

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