Other
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..361g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 15, 1987, p. 361-371.
Other
37
A Stars, Abundance, Calcium, Metallic Stars, Stellar Composition, Stellar Spectra, Electrophotometry, K Lines, Spectral Line Width
Scientific paper
Abundances of calcium, log N(Ca), are derived for a fairly complete sample of 57 single-lined classical Am stars. Published photoelectric measures of the CaII K-line at 3933 A and K-line spectral types are used to determine the equivalent widths of the K-line for a differential curve-of-growth comparison of the Am stars with the standard stars 15 Vul and 28 And. On a scale with log N(H) = 12.0, the values of log N(Ca) for the Am stars range from 5.5 to 6.5, the solar value being 6.36. The Am stars with low abundances of calcium have a small range of the modified age parameter, and absolute magnitudes within about 1.3 mag of the zero-age main sequence, whereas the other Am stars and normal stars have a larger spread in age. These results are probably consistent with the suggestion that the Am phenomenon is due to subphotospheric separation of elements by diffusion in slowly rotating A-type stars.
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