2004A&A...422..289G


Query : 2004A&A...422..289G

2004A&A...422..289G - Astronomy and Astrophysics, volume 422, 289-306 (2004/7-4)

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

GAUTSCHY-LOIDL R., HOEFNER S., JORGENSEN U.G. and HRON J.

Abstract (from CDS):

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 25µm 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 5µm. At longer wavelengths our models showing mass loss offer a first self-consistent qualitative explanation of why a strong feature around 14µm, which is predicted by all hydrostatic models as well as dynamical models showing no mass loss, is missing in observed AGB carbon star spectra.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: atmospheres - stars: variables: general - carbon - hydrodynamics - stars: radiative transfer

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* WZ Cas C* 00 01 15.8567946264 +60 21 19.025920224 8.77 9.47 7.13     C-N7III: 310 0
2 V* T Lyr C* 18 32 20.0767626264 +36 59 55.635218376   12.74 7.84 7.30   C-J4:p 177 1
3 V* S Cep C* 21 35 12.8233100592 +78 37 28.185141792   12.13 7.40     C7,3e 254 0
4 V* V460 Cyg C* 21 42 01.0830893088 +35 30 36.719916552 12.97 8.32 5.84 4.10 2.71 C-N5 206 1
5 * 19 Psc C* 23 46 23.5164473376 +03 29 12.519049272 10.95 7.62 5.02 3.19 1.82 C-N6 439 0

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2022.08.18-04:44:31

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