Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..299s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 299-307. Research supported by Leverhulme Trust.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, Auriga Constellation, Chromosphere, Eclipsing Binary Stars, Stellar Atmospheres, Supergiant Stars, Absorption Spectra, Binary Stars, High Resolution, Ionization, Iron, Magnesium
Scientific paper
High-resolution spectra of the 1987 eclipse of Zeta Aur at chromospheric and partial phases (during ingress) yield height resolution and enable the lower chromospheric layers of the K-supergiant primary star to be modeled empirically. Curves of growth are applied to analyze chromospheric absorption spectra, and the fact that the B star has an appreciable disk is taken into account. The final column densities are modeled numerically by a simple density/height relationship for each observed atomic species, and yield ionization ratios Fe II: Fe I and Mg II: Mg I. Electron densities are calculated by comparing the ionization equilibria of iron and magnesium.
Griffin Elizabeth M. R.
Griffin Roger F.
Schroeder Klaus-Peter
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