IRAS low resolution spectra of cool carbon stars. IV - A scenario for carbon star evolution

Details IRAS low resolution spectra of cool carbon stars. IV - A scenario for carbon star evolution IRAS low resolution spectra of cool carbon stars. IV - A scenario for carbon star evolution

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196..173w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 173-184. Research supported by the Stichting Astron

Astronomy and Astrophysics

Astronomy

129

Carbon Stars, Cool Stars, Infrared Astronomy Satellite, Mira Variables, Stellar Evolution, Stellar Spectra, Asymptotic Giant Branch Stars, S Stars, Stellar Composition, Stellar Envelopes, Stellar Mass Ejection

Scientific paper

A scenario of carbon star evolution is presented and discussed. The model can be used to satisfactorily fit the spectral energy distributions of individual group II carbon stars and reproduce the distribution of stars in the log (S12/S25) versus log (S25/S60) color-color diagram. Model calculations based on a simple expanding 'silicate' dust shell model are used to derive a timescale for the transition from oxygen-rich Mira to carbon-rich Mira of about 10,000 yr. After the onset of the high-mass loss carbon Mira phase it takes a few thousand years for the star to produce a circumstellar dust shell that completely masks the star in the optical. The chemical peculiarities of carbon stars also schematically fit into this scenario. The derived timescales are consistent with the stellar birthrate and the local space density of carbon stars. This scenario implies that present theories of AGB evolution need revision.

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