The chemical composition of δ Scuti*

Details The chemical composition of δ Scuti* The chemical composition of δ Scuti*

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.359..865y&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 359, Issue 55, pp. 865-873.

Astronomy and Astrophysics

Astronomy

8

Line: Identification, Stars: Abundances, Stars: Atmospheres, Stars: Evolution, Stars: Individual: Δ Sct, Stars: Individual: Hd 57749

Scientific paper

We present chemical abundances in the photosphere of δ Scuti (δ Sct) - a prototype of the class of pulsating variables - determined from the analysis of a spectrum obtained by using the 2-m telescope at the Peak Terskol Observatory and a high-resolution spectrometer with R= 52000, a signal-to-noise ratio 250 and from International Ultraviolet Explorer spectra. The abundance pattern of δ Sct consists of 49 chemical elements. The abundances of 19 elements have not been investigated previously. The abundances of Pr and Nd obtained from the lines of the second and third spectra are equal. The abundances of heavy elements indicate the overabundances with respect to the solar system values up to 1 dex. The abundance pattern of δ Sct is similar to the abundance patterns of Am-Fm or δ Del type stars.
A splitting of the cores of all clean lines is observed for the spectra of δ Sct and HD 57749. This can signify evidence of non-radial pulsations in these stars.

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