Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sci...224..987w&link_type=abstract
Science (ISSN 0036-8075), vol. 224, June 1, 1984, p. 987-989. NASA-supported research.
Astronomy and Astrophysics
Astronomy
57
A Stars, Comets, Cosmic Dust, Infrared Astronomy Satellite, Stellar Envelopes, Asteroids, Extrasolar Planets, Particle Size Distribution, Thermal Radiation, Vega, Infrared Astronomical Satellite, Iras, Distance, Temperature, Ice, Condensation, Nebula, Volatiles, Composition, Observations, Astronomy, Water Ice, Comets, Physical Properties, Mass, Asteroids, Comparisons
Scientific paper
The Infrared Astronomical Satellite (IRAS) science team has discovered a shell of particulate material around the star Vega. At the mean distance and temperature of the shell, the expected condensation products from a protostellar nebula would be dominated by frozen volatiles, in particular water ice. It is not possible to discriminate between dirty ice and silicate materials in the Vega shell on the basis of the IRAS data. The Vega shell is probably a ring of cometary bodies with an estimated minimum mass of 15 earth masses, analogous to one that has been hypothesized for the solar system. A possible hot inner shell around Vega may be an asteroid-like belt of material a few astronomical units from the star.
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