Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165..126s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. 126-134.
Astronomy and Astrophysics
Astrophysics
63
Binary Stars, Calcium, Centaurus Constellation, Emission Spectra, Stellar Composition, Stellar Spectra, Abundance, Magnetohydrodynamic Turbulence, Metallicity, Stellar Temperature
Scientific paper
Selected regions containing calcium lines of moderately high excitation (2.5 eV) in the spectra of α Cen A and α Cen B have been recorded at a dispersion of 1.5 Å mm-1 and with signal/noise ≡100 using a silicon diode array (Reticon). Both stars are found to be metal-rich by 0.2 dex compared to the Sun: α Cen A has Teff = 5820±50K and log g = 4.4±.1; α Cen B has Teff = 5280±100K and log g = 4.65±.15. The analysis of calcium lines reveals that the microturbulence in α Cen A is identical to that in the solar atmosphere and larger than the microturbulence in α Cen B. Line profiles in α Cen B are significantly narrower than those in α Cen A and it seems probable that the difference in microturbulence is accompanied by a difference in macroturbulence.
Edvardsson Bengt
Frisk Urban
Smith Gordon
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