New abundance determinations for the atmosphere of the AM star 15 VUL

Mathematics – Probability

Scientific paper

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A Stars, Peculiar Stars, Stellar Composition, Light Elements, Metallicity, Ccd Cameras, Line Spectra, Nitrogen, Sulfur

Scientific paper

The abundances of light elements in the atmosphere of the mild Am star 15 Vul have been derived from new CCD observations. For nitrogen and sulfur, these determinations were carried out for the first time. It was established that some light elements (silicon and magnesium) in the atmosphere of this mild metallic-line star, which is characterized by nearly solar abundances of calcium and scandium, are deficient relative to the sun, whereas others (sodium and sulfur) show an enhancement. The log epsilon (Fe) values deduced from FeI and FeII lines are in good agreement, suggesting a nearly solar iron abundance. The abundances of yttrium and barium were refined. A comparison with the results of new evolutionary calculations produced no appreciable changes in the evolutionary parameters of 15 Vul. However, this comparison may alter the evolutionary status of this star. In all probability, 15 Vul has not yet completed its evolution on the main sequence.

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