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2000ApJ...530..408V - Astrophys. J., 530, 408-417 (2000/February-2)
Infrared space observatory spectroscopy of extreme carbon stars.
VOLK K., XIONG G.-Z. and KWOK S.
Abstract (from CDS):
We present radiative transfer models for the spectra of these five stars assuming that the dust is amorphous carbon. The derived optical depths at 11.2 µm range from 1.4 to 4.5, corresponding to optical depths at V=190-600, making these stars among the asymptotic giant branch (AGB) stars with the most optically thick dust envelopes. From the model fittings, we found the 30 µm features to be optically thick with 5%-8% of the total stellar luminosities being emitted in the feature. For four of the five stars, the models also suggest that their mass-loss rates have been increasing rapidly over the last few 104 yr periods, with current mass-loss rates as high as 4x10–4 (D/kpc) M☉.yr–1. Such high mass-loss rates imply that these stars are in the final stages of AGB evolution. The observations of these extreme carbon stars therefore represent the best cases to study the transition from AGB to proto-planetary nebulae.
Abstract Copyright: ∼
Journal keyword(s): Infrared: Stars - Radiative Transfer - Stars: Carbon - Stars: Evolution - Stars: Late-Type - Stars: Mass Loss
Simbad objects: 12
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