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Interpretation of Carbon Stars Spectra from Model Atmospheres Computations*

Published online by Cambridge University Press:  30 March 2016

F. Querci  and
M. Querci
F. Querci
Affiliation:
Laboratoire du Télescope Infrarouge, D.E.P.E.G., Observatoire de Paris, Meudon, France
M. Querci
Affiliation:
Laboratoire du Télescope Infrarouge, D.E.P.E.G., Observatoire de Paris, Meudon, France

Extract

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The first part of this paper presents a grid of model atmospheres for carbon stars in which the most striking feature is the inclusion of the molecular line blanketing effect of CO, CN and C2 through opacity probability distribution functions. The techniques and the main results have been fully discussed in previous papers (Querci, 1972; Querci et al., 1972 and 1973), and consequently we will give just a rapid description asking the reader to refer to these papers for details. However, the grid has been extended here to lower temperatures.

The second part presents original results from the M. Querci’s ‘Thèse d’Etat’ (1974), and concerns the computation of synthetic spectra. A kind of grid of synthetic spectra has been computed from each model atmosphere, that is to say for each particular effective temperature and gravity, over a selected spectral range. The influence of the gravity and of the effective temperature on the computed spectra and the problem of the line cutting procedure are considered. Finally, comparisons with a high resolution infrared spectrum of a carbon star are made.

The conclusion summarizes the experimental progress that must be made in order to be able to make meaningful comparisons between predictions and observations.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 3: Highlights of Astronomy. As presented at the XVth General Assembly of the IAU, 1973 , 1974 , pp. 341 - 356
Copyright
Copyright © Reidel 1974

Footnotes

*

Presented by F.Q.

References

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