Non-LTE Abundance Analyses of Nitrogen and Sulfur in Chemically Peculiar Stars of the Upper Main Sequence

Details Non-LTE Abundance Analyses of Nitrogen and Sulfur in Chemically Peculiar Stars of the Upper Main Sequence Non-LTE Abundance Analyses of Nitrogen and Sulfur in Chemically Peculiar Stars of the Upper Main Sequence

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..739t&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.739-752.

Astronomy and Astrophysics

Astronomy

13

Spectroscopy, Stars: Abundances, Stars: Atmospheres, Stars: Chemically Peculiar Stars, Stars: Early-Type

Scientific paper

The LTE and non-LTE abundances of nitrogen (N) and sulfur (S) in chemically peculiar stars of the upper main sequence were derived from the NI and SI lines observed in a near-infrared spectral region. The sample consisted of 11 stars: three HgMn stars, two Am stars, three magnetic Ap (SrCrEu) stars, two weak-lined stars, and one normal star. The following results were obtained: (1) the LTE abundances of N suffer a large non-LTE effect with correction factors of up to -0.6 dex, while those of S suffer a minor non-LTE effect with correction factors of up to -0.2 dex; (2) the non-LTE abundances of N are systematically below solar value among the sample stars. Although the deficiencies of N are mild in the normal and weak-lined stars, they are enhanced by a factor of up to 2 dex in HgMn stars. A star-to-star variation with a range of 1 dex or more in the N deficiency is shown in Am and SrCrEu stars; (3) the non-LTE abundances of S are solar or slightly overabundant among the sample stars, except for SrCrEu stars. S is systematically deficient relative to the Sun by a factor of >~ 0.7 dex in SrCrEu stars.

Affiliated with

Also associated with

No associations

Rating

Non-LTE Abundance Analyses of Nitrogen and Sulfur in Chemically Peculiar Stars of the Upper Main Sequence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Non-LTE Abundance Analyses of Nitrogen and Sulfur in Chemically Peculiar Stars of the Upper Main Sequence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-LTE Abundance Analyses of Nitrogen and Sulfur in Chemically Peculiar Stars of the Upper Main Sequence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1139749