Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190..148e&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. 148-166.
Astronomy and Astrophysics
Astrophysics
61
Stellar Composition, Stellar Gravitation, Stellar Mass, Stellar Spectra, Subgiant Stars, Astronomical Photometry, Atmospheric Models, Metallicity
Scientific paper
Logarithmic surface gravities between 2.9 and 3.8 (cgs) have been determined for 8 G 8 IV-K2III stars from the analysis of pressure broadened wings of strong metal lines. Comparisons with trigonometrically determined surface gravities give support to the spectroscopic results. A thorough and rather conservative error analysis suggests that the errors are smaller than about 30 percent and confirms that the method is very insensitive to uncertainties in the fundamental stellar atmospheric parameters. Surface gravities of Alpha Cen A and B and of Arcturus, Alpha Boo, have also been obtained. Chemical abundances have been derived for 12 elements from Na to Ni, and for five heavier elements from Y to Nd, tentative abundances have been estimated from a single line of each element. Effective temperatures in the photometric system of Frisk (1983) are found to be consistent with spectroscopic temperatures from the excitation equilibrium of Fe I.
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