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Photometry of the near-infrared O I feature in A- and F-type stars

J. M. Sorvari

Abstract

A photometric parameter r (01) is to study the 0 I feature at 777 1,7774,7775 in normal A- and F-type stars. It is shown that r (0 I) is temperature sensitive in A-type supergiants and luminosity sensitive in F-type supergiants. Using stars in galactic clusters, an absolute magnitude calibraflon is found for F-type supergiants. The behavior of r (0 I) in variable and peculiar stars is also discussed.

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Key concepts: Physics, Supergiant, Astrophysics, Photometry (optics), Stars, Red supergiant, Blue supergiant, Astronomy