A photometric determination of the metal content for F-G type supergiants in the Large Magellanic Cloud

Astronomy and Astrophysics – Astrophysics

Scientific paper

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F Stars, G Stars, Magellanic Clouds, Metallicity, Stellar Composition, Stellar Spectrophotometry, Supergiant Stars, Cepheid Variables, Hertzsprung-Russell Diagram, Interstellar Extinction, Ubv Spectra, Variable Stars

Scientific paper

A VBLUW photometric analysis is used to derive the metal content of some 100 F- and G type supergiants in the LMC. Using the empirical locus of Pel in the V-B/B-L diagram in conjunction with the relative dependence of theoretical colors on the metal abundance, a metal deficiency of 1.4-1.6 is found for the LMC stars in comparison with those in the solar neighborhood. With an average UBV system foreground reddening of E(B-V) = 0.05 for the LMC, these stars have a metal content of 0.66 + 0.11, -0.03 of the solar abundance. Agreement is found with the result of previous studies. Application to the derivation of the reddenings of most of the galactic supergiants is noted.

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