Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..265s&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 2, Aug. 1981, p. 265-268.
Astronomy and Astrophysics
Astrophysics
6
Abundance, Giant Stars, Late Stars, Stellar Mass Ejection, Stellar Models, Atmospheric Composition, Atmospheric Models, Helium, Iron, Stellar Atmospheres, Stellar Evolution, Stellar Temperature, Titanium
Scientific paper
The influence of the choice of Arcturus atmosphere model type on the determination of its surface gravity, and therefore its mass, is studied. It is shown that, even without accounting for possible effective temperature determination errors, proceeding from a fixed effective temperature and helium abundance may result in changes in the value of the mass deduced by a factor of four among the various models. While this implies that conclusions as to stellar evolution and mass loss in giant stars are not yet warranted, it is suggested that the virtual identity of Ti/Fe abundance ratios among the models gives confidence in the determination of the atmospheric chemical composition of this type of stars.
Martin Pamela
Spite Monique
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