Abundances of distant classical Cepheid variables

Details Abundances of distant classical Cepheid variables Abundances of distant classical Cepheid variables

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..655h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 655-666. Research supported by the Natural Sciences

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23

Cepheid Variables, Stellar Composition, Abundance, Milky Way Galaxy, Spectrum Analysis, Stellar Atmospheres, Stellar Spectra, Stellar Temperature

Scientific paper

A high-dispersion abundance analysis has been carried out for eight Cepheid variables spanning 8 kpc in galactocentric radius. A differential analysis relative to the comparison supergiant Mu Per was used to derive the temperature, microturbulence, and abundances for each star. When combined with results of Luck and Lambert, the temperature scale for Cepheids is well defined, with an observed range of temperature of about 600 K at a given period. The anticenter Cepheid TV Cam is found to be slightly metal-deficient with normal micro-turbulence; the other anticenter Cepheids are somewhat more metal-poor. The spectroscopic abundances are in good agreement with photometric abundances found previously from Washington-system colors and provide support for the abundance gradient in iron among young disk stars of -0.07 per kpc.

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