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On the Gravity Determination from Carbon Star Spectra

Published online by Cambridge University Press:  04 August 2017

H. Gass
H. Gass*
Affiliation:
Institute of Theoretical Astrophysics, Heidelberg

Abstract

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Spectra of carbon dwarf and giant stars may look very similar, as is demonstrated, e. g., by TT CVn and G77-61. Model calculations show that the bands of C2, CN and CO cannot be used in the range log g = 0……6 for log g determinations, since they are affected by abundance. If, moreover, lines of two ionization stages cannot be observed in any element, the only log g indicator would seem to be the ratio of the MgH band and the Mg I b lines. Simple analytic expressions are derived which demonstrate the relation between spectral appearance, abundances and gravity.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 111: Calibration of Fundamental Stellar Quantities , 1985 , pp. 429 - 431
Copyright
Copyright © Reidel 1985 

References

Dahn, C. C., Liebert, J. and Hintzen, P. M. 1977, Astrophys. J., 216, 757.Google Scholar
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