Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l..65s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 1, 1981, p. L65-L68. Research supported by the Alfred P.
Astronomy and Astrophysics
Astrophysics
12
Abundance, Carbon Stars, Galactic Bulge, Galactic Nuclei, M Stars, Metallic Stars, Milky Way Galaxy, Giant Stars, Ratios, Stellar Temperature
Scientific paper
A nonphotometric method for the determination of metal abundances in nearby galaxies is presented. The method involves a theoretical calibration of the observed strong correlation between the ratio of cool carbon stars to M giants (C/M ratio) with metal abundance, assuming that carbon stars are internally mixed during helium shell flashes. A lower limit on the mass fraction of metals in the Galactic nuclear bulge of 0.05 is determined by this means from the observed C/M ratio. The same method can be applied to Local Group galaxies when C/M ratios for these galaxies become available. The sensitivity of the C/M ratio to metal abundance may also affect the interpretation of galactic colors.
Miller Emily G.
Scalo John M.
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