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

Autor(en)

Rita Loidl, Susanne Höfner, Uffe Grae Jorgensen, Josef Hron

Abstrakt

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 œm of TX Psc, WZ Cas, V460Cyg, 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 5œm. At longer wavelengths our models showing mass loss offer a first self-consistent qualitative explanation of why a strong feature around 14 œm, which is predicted by all hydrostatic models as well as dynamical models showing no mass loss, is missing in observed AGB carbon star spectra.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Uppsala University, University of Copenhagen

Journal

Astronomy & Astrophysics

Band

422

Seiten

289-306

Anzahl der Seiten

18

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361:20035860

Publikationsdatum

2004

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a4f9eca8-c6e3-4834-ab9d-f3eba1fd8331