Molecular equilibria and the luminosity classification of G and K stars

Details Molecular equilibria and the luminosity classification of G and K stars Molecular equilibria and the luminosity classification of G and K stars

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..777b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Aug. 1991, p. 777-786.

Astronomy and Astrophysics

Astronomy

15

G Stars, K Stars, Stellar Luminosity, Stellar Spectrophotometry, Carbon Monoxide, Dwarf Stars, Line Spectra, Opacity, Stellar Atmospheres

Scientific paper

Synthetic spectra have previously been used to discuss the calibration of CO band indices and the C(41-42), C(42-45) and C(45-48), C(42-45) diagrams of the DDO photometric system. The band passes of the latter system are strongly influenced by lines of CN, CH, MgH, and SiH, with the SiH lines affecting the 41 pass band in dwarfs. Simple formulas which make predictions of the strengths of these lines are discussed. The results of these formulas are compared with approximate calculations of the ratio of line to continuous absorption coefficients in the stellar atmospheres. The luminosity dependence of the CO bands is shown to be a consequence of the lower continuous absorption coefficient in giant star atmospheres as compared to dwarfs. The lesser depletion of carbon by CO formation and lower continuous opacity in giants with T(eff) less than 4500 K leads to them having stronger CN and CH bands than the corresponding dwarfs. The relative importance of CH as a continuous opacity source is considered.

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