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Title:
Carbon stars with oxygen-rich circumstellar dust shells Observational evidence for the onset of the carbon star phase
Authors:
Willems, Frits J.; de Jong, Teije
Affiliation:
AA(Amsterdam, Universiteit, Netherlands), AB(Amsterdam, Universiteit, Netherlands)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. L39-L42. Research supported by the Stichting Astronomisch Onderzoek in Nederland. (ApJL Homepage)
Publication Date:
10/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Carbon Stars, Cosmic Dust, Oxygen, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry, Emission Spectra, Visible Spectrum
DOI:
10.1086/184756
Bibliographic Code:
1986ApJ...309L..39W

Abstract

Results from the IRAS Low Resolution Spectrograph (LRS) are presented which show that some carbon stars are surrounded by circumstellar shells containing oxygen-rich silicate-type dust rather than carbon-rich dust. This observation suggests that these stars have quite recently become carbon stars because they are still surrounded by the last remnant of the oxygen-rich M-type phase. It also suggests a direct transition from M-type to C-type rather than through an intermediate S phase. The transition takes place in about 100 years. Using a simple statistical argument, the typical duration of the carbon star phase is estimated to be from 1000 to 10,000 years.

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