Dynamic model atmospheres of AGB stars. IV. A comparison of synthetic carbon star spectra with observations

Details Dynamic model atmospheres of AGB stars. IV. A comparison of synthetic carbon star spectra with observations Dynamic model atmospheres of AGB stars. IV. A comparison of synthetic carbon star spectra with observations

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...422..289g&link_type=abstract

Astronomy and Astrophysics, v.422, p.289-306 (2004)

Astronomy and Astrophysics

Astrophysics

56

Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Variables: General, Stars: Carbon, Hydrodynamics, Radiative Transfer

Scientific paper

We have calculated synthetic opacity sampling spectra for carbon-rich Asymptotic Giant Branch (AGB) stars based on dynamic model atmospheres which couple time-dependent dynamics and frequency-dependent radiative transfer, as presented in the third paper of this series. We include the molecules CO, CH, CN, C2, CS, HCN, C2H2 and C3 in our calculations, both when computing the atmospheric structures, and the synthetic spectra. A comparison of the synthetic spectra with various observed colours and spectra in the wavelength range between 0.5 and 25 μm,of TX Psc, WZ Cas, V460 Cyg, T Lyr and S Cep is presented. We obtain good agreement between observations gathered at different phases and synthetic spectra of one single hydrodynamical model for each star in the wavelength region between 0.5 and 5 μm. At longer wavelengths our models showing mass loss offer a first self-consistent qualitative explanation of why a strong feature around 14 μm, which is predicted by all hydrostatic models as well as dynamical models showing no mass loss, is missing in observed AGB carbon star spectra.

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