Statistics – Computation
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..185g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 185-188.
Statistics
Computation
4
Carbon Stars, Computational Astrophysics, Giant Stars, Stellar Atmospheres, Helium, Nitrogen, Optical Thickness, Oxygen, Stellar Composition
Scientific paper
Spectra of carbon dwarf and giant stars may look very similar. Model calculations show that the bands of C2, CN and CO cannot be used in the range log g = 0 to 5.5 for gravity 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 seems to be the ratio of the MgH band and the Mg Ib lines. Simple analytic expressions are derived which demonstrate the relation between spectral appearance, abundances and gravity. As a consequence of the special form of the optical depth an indirect method to determine the H/He ratio is derived.
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