Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..441h&link_type=abstract
Nature (ISSN 0028-0836), vol. 307, Feb. 2, 1984, p. 441, 442.
Astronomy and Astrophysics
Astronomy
27
A Stars, Far Infrared Radiation, Infrared Astronomy Satellite, Stellar Envelopes, Stellar Radiation, Emissivity, Interstellar Matter, Radiant Flux Density, Thermal Emission
Scientific paper
The Infrared Astronomy Satellite (IRAS) has recently detected a compact far-infrared emission source associated with Vega. This flux appears to be thermal emission from dust heated by the visual/UV luminosity of Vega. Although circumstellar dust is commonly associated with young, early-type stars, the characteristics of the emission from Vega are quite atypical. The essential difference is the relatively low temperature of the dust for the observed source size. This low temperature implies that the dust grains producing the far-infrared emission must be very efficient 60/100-micron emitters and must, therefore, be much larger than typical interstellar and circumstellar dust grains. To place more limits on the properties of this far-infrared emission region, Vega was observed at 47 and 95 microns with the Kuiper Airborne Observatory on the night of August 12-13, 1983. The IRAS results are confirmed and it is shown that the source size may be as large as 46 arc s along some axis.
Harvey Paul Michael
Joy Marhshall
Wilking Bruce A.
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