Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988afz....28..343b&link_type=abstract
Astrofizika, Vol.28:2, P. 343-353, 1988
Astronomy and Astrophysics
Astronomy
12
Scientific paper
Non-LTE populations of the Na I atomic levels are calculated for six F-supergiants and three dwarfs. The profiles and equivalent widths W_lambda of some Na I lines of interest are computed. It is shown thatordinary changes in widths W_lambda of subrodinate lines relative to LTE are not more than 10% and they do not lead to appreciable correction in the sodium abundance (corrections are less than 0.1 dex). Only for most massive supergiants with log g ~ 0 the derived abundance might be reduced by about 0.2 dex. The Na overabundance found for yellow supergiants from LTE analysis is confirmed. The correlation between the Na excess and log g obtained earlier is confirmed, too; probably it is a result of the analogous correlation between the Na excess and masses of supergiants (fig.3). It is noticed that the modern calculations confirm the supposition that the source of enhanced sodium abundance is the NeNa-cycle.
Boyarchuk Alexander A.
Hubeny Ivan
Kubát Jiri
Lyubimkov Leonid S.
Sakhibullin N. A.
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