On the Abundances of Nitrogen and Sulfur in Late-B through F Supergiants Atmospheres

Details On the Abundances of Nitrogen and Sulfur in Late-B through F Supergiants Atmospheres On the Abundances of Nitrogen and Sulfur in Late-B through F Supergiants Atmospheres

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..169t&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.169-188.

Astronomy and Astrophysics

Astronomy

23

Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Evolution, Stars: Supergiants

Scientific paper

An extensive non-LTE analysis of NI and SI lines at the spectral region around lambda ~ 8700Angstroms was performed for late-B through F supergiants in order to determine the photospheric abundances of N and S in such massive evolved stars. It was revealed that the abundances of nitrogen in these stars show a rather large diversity ( ~ +/- 0.4 dex) around the mean of [N/H] =~ 0.3 relative to the Sun, being roughly divided into three groups: (i) markedly large overabundances amounting to 0.6--0.7 dex, (ii) mild N-excesses of 0.3--0.4 dex, and (iii) near-solar (or slightly subsolar) [N/H]-values. The abundances of sulfur for F-supergiants were found to be nearly homogeneous and not much different from the solar composition ([S/H] ~ -0.2), while those for the A-type generally show a tendency of S-excess (up to +0.8 dex) systematically increasing with T_eff. There also appears a trend of mass-dependence as well as a possibility of mutual correlation regarding the values of [N/H] and [S/H] in those A-supergiants. It was confirmed that the extent of the N-excess in A--F supergiants tends to depend on that of sodium as [N/H] =~ [Na/H].

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