Circumstellar shells resolved in IRAS survey data. II - Analysis

Details Circumstellar shells resolved in IRAS survey data. II - Analysis Circumstellar shells resolved in IRAS survey data. II - Analysis

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..725y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 2, p. 725-738.

Astronomy and Astrophysics

Astronomy

89

Infrared Astronomy, Planetary Nebulae, Red Giant Stars, Stellar Envelopes, Stellar Mass Ejection, Carbon Stars, Mira Variables, Stellar Models

Scientific paper

IRAS survey data for 512 red giant stars and young planetary nebulae were processed using a computer program which fitted the data to an idealized model of a circumstellar shell. Seventy-six of these stars were found to have circumstellar shells resolved in the 60-micron survey data. Forty pct of the 76 stars are carbon stars. Thirteen are Mira variables. The evolution of these shells, involving the interaction of the expelled material with the ISM, is modeled, and the results suggest that the period during which Mira variables lose mass lasts for approximately 10 exp 5 yr. Carbon stars are found to shed mass for about 2 x 10 exp 5 yr. The expansion velocity of the outer shell for the largest shells will normally be lower by a factor of 3-5 than the expansion velocity obtained from CO observations.

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