Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l.129g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 1, 1979, p. L129-L133. NSF-supported research.
Astronomy and Astrophysics
Astronomy
14
Binary Stars, Early Stars, Silicates, Stellar Envelopes, Supergiant Stars, Cosmic Dust, Emission Spectra, Grains, Infrared Astronomy, Near Infrared Radiation, Radio Sources (Astronomy)
Scientific paper
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.
Gehrz Robert D.
Grasdalen Gary L.
Hackwell John A.
McClain D.
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