Far-infrared observations of the peculiar variable star R Aquarii

Details Far-infrared observations of the peculiar variable star R Aquarii Far-infrared observations of the peculiar variable star R Aquarii

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..167a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 167-170. Research supported by the Department of S

Astronomy and Astrophysics

Astronomy

17

Cosmic Dust, Infrared Astronomy, Peculiar Stars, Variable Stars, Far Infrared Radiation, Interstellar Matter, Mira Variables, Silicates, Stellar Envelopes, Stellar Models

Scientific paper

The first results on the peculiar Mira variable star R Aquarii obtained by the IRAS satellite in the far-infrared region are presented. A simple model in terms of circumstellar dust emission is given to interpret the far-infrared excess. A two-dust shell model with silicate grains of size 1 μm at temperatures 800±80K and 87±8K seems to fit the observations remarkably well in addition to the stellar emission at 2800K. It is shown that this model explains the near and mid-infrared fluxes as well. In comparison, another Mira variable U Ori also showed two dust shells but with lower temperatures and smaller grain sizes. Implications of these results on the nature of R Aquarii are discussed.

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