Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..371h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 371-379. Research supported by the Universite de Lau
Astronomy and Astrophysics
Astrophysics
28
A Stars, Abundance, F Stars, Giant Stars, Metallicity, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Peculiar Stars, Stellar Luminosity, Stellar Magnitude, Stellar Temperature, Tables (Data)
Scientific paper
132 stars considered as A and F giants have been studied for their properties in the Geneva photometric system. It is shown that this system to derive the temperature, absolute magnitude and Fe/H value for stars in this part of the HR diagram. 36 percent of the stars of our sample exhibit an enhanced value Delta m2 that can be interpreted in terms of Fe/H. The red limit of stars having an enhanced Fe/H value is 0.225 in B2-V1 or 6500 K in Teff. This corresponds to the limit defined by Vauclair and Vauclair (1982) where the diffusion timescale is equal to the stellar lifetime and permits the assumption that the diffusion is the process responsible for the metallicism observed in the A and F giants.
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