On the surface gravitives of AM stars

Details On the surface gravitives of AM stars On the surface gravitives of AM stars

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..787d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 1, 1986, p. 787-792. SERC-supported research.

Astronomy and Astrophysics

Astronomy

41

A Stars, Metallicity, Peculiar Stars, Stellar Gravitation, Stellar Temperature, Surface Properties, Open Clusters, Ubv Spectra

Scientific paper

Large systematic difference between effective temperatures and surface gravities determined by Lane and Lester (1984) through comparison of observed flux distributions with model atmospheres, and values determined from photometric colors and indices, are shown to be strongly correlated with metallicity. Using uvby-beta photometry for 34 Am stars and 48 normal stars in five open clusters, it is shown that the method of Moon and Dworetsky (1985) for obtaining T(eff) and log g, is relatively insensitive to delta-m0. The surface gravities of Am stars in open clusters are found to be the same as those of normal stars of similar effective temperatures. A small correction for metallicity should be applied to surface gravities of stars with T(eff) less than or equal to 8500 K.

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