Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....38..239m&link_type=abstract
Astronomy and Astrophysics, vol. 38, no. 2, Jan. 1975, p. 239-257.
Astronomy and Astrophysics
Astrophysics
170
Astronomical Models, Atmospheric Models, Giant Stars, Spectrum Analysis, Stellar Atmospheres, Stellar Mass, Absorption Spectra, Abundance, Astronomical Photometry, Atomic Spectra, Chemical Composition, Data Acquisition, Line Spectra, Molecular Spectra, Stellar Motions
Scientific paper
The spectrum of the high-velocity red giant, alpha Boo (Arcturus), is analyzed relative to that of the sun, using spectral-line data from the Arcturus Atlas and a differential technique employing empirical atmospheric models for both stars. The line data and several photometric observations are used to determine the effective temperature and the surface gravity, and a very low mass (between 0.1 and 0.6 solar mass) is calculated, implying a substantial mass loss. The chemical composition of the red giant is determined from the atomic, ion, and molecular lines of 32 elements, and an average underabundance of about a factor of 4 is found along with a significantly different abundance pattern than the sun's. Evidence is presented which indicates that Arcturus is not in the first giant phase following the main sequence, but is a more evolved star which may have experienced the helium flash.
Griffin R. R.
Holweger Hartmut
Maeckle R.
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