IRAS observations of a large circumstellar dust shell around W Hydrae

Details IRAS observations of a large circumstellar dust shell around W Hydrae IRAS observations of a large circumstellar dust shell around W Hydrae

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229l...5h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

30

Cosmic Dust, Infrared Astronomy Satellite, Interstellar Matter, Missing Mass (Astrophysics), Satellite Observation, Stellar Envelopes, Interstellar Radiation, Planetary Nebulae, Red Giant Stars, Supernova Remnants

Scientific paper

IRAS observations at 60 and 100 microns reveal a large 30-40-arcmin (about 1-pc) diameter dust shell centered on the oxygen-rich red giant W Hya. Except for SNRs, this is the largest mass-loss envelope, in apparent diameter, known around any evolved star, including PN. W Hya's radiation field, stronger than the interstellar radiation field in the outer envelope, is sufficient to heat dust grains with IR emissivity proportional to lambda exp -1.2 to temperatures of about 40 K implied by the ratio of intensities at 60 and 100 microns.

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