Cooling of the newly condensed shell around HD 193793

Details Cooling of the newly condensed shell around HD 193793 Cooling of the newly condensed shell around HD 193793

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..183w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 183-185.

Astronomy and Astrophysics

Astronomy

10

Carbon Stars, Infrared Astronomy, Stellar Envelopes, Stellar Temperature, Cooling, Cosmic Dust, O Stars, Stellar Models, Stellar Spectrophotometry

Scientific paper

JHK(L-prime)M photometry of the WC7 + O5 system HD 193793 is analyzed which was performed to study the evolution of the circumstellar dust shell detected by IR photometry some time between June 1976 and September 1977. The observations are modeled with an appropriate combination of an optically thin shell of graphite grains and a 40,000-K blackbody representing the O-type star. The results indicate that the grains cooled from a temperature of 810 K to 780 K over a three-month period, probably as a consequence of shell expansion. The time the shell was shed is estimated for the case where the shell expands with a constant velocity equal to that of the mass loss (2500 km/s).

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