The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe

Details The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..205b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 205-216.

Astronomy and Astrophysics

Astrophysics

47

A Stars, Abundance, Aluminum, F Stars, Iron, Lithium, Silicon, Late Stars, Signal To Noise Ratios, Spectral Resolution

Scientific paper

An observational investigation of 25 A and Am stars is presented in which a model-atmosphere abundance analysis is used to determine the photospheric abundances of Li, Al, Si, and Fe. Results of the present observations are combined with the observations of Hyades by Burkhart et al. (1989) to develop homogeneous results from a large sample. All of the elements except Li are found to be constant as a function of temperature for Am stars, and Al and Fe are moderately enhanced for A4-F1 stars. The abundance range of Li can be twice that of Al, Si, and Fe in Am normal stars, and other stars exhibit Li deficiencies that are interpreted as indicative of weak evolution. The abundances of Li, Ca, and Zr are also considered in terms of diffusion theory for Am stars, and references to the hydrogen-convection and diffusion zones are made.

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