The Physical Basis of MK Luminosity Classification in the A and F-type Stars

Details The Physical Basis of MK Luminosity Classification in the A and F-type Stars The Physical Basis of MK Luminosity Classification in the A and F-type Stars

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.8105g&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #81.05; Bulletin of the American Astronomical Society, Vol. 28, p.1383

Astronomy and Astrophysics

Astronomy

Scientific paper

As part of a continuing project investigating the physical basis of luminosity classification in the late A, F and G-type stars, we report on the determination of the basic parameters (effective temperature, gravity, microturbulent velocity and metallicity), using classification-resolution spectra and spectral synthesis, of a number of A and F-type stars, ranging in luminosity class from dwarf (V) to supergiant (Ib). We confirm the suggestion made in earlier papers that microturbulence plays as large a role in the behavior of the MK luminosity criteria (based on lines of ionized species) as gravity, and discuss the existence of a correlation between gravity and the microturbulent velocity. The relevance of this study to the interpretation of MK spectral types is discussed as well.

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