An abundance analysis of the bright RV Tauri variable R Scuti

Details An abundance analysis of the bright RV Tauri variable R Scuti An abundance analysis of the bright RV Tauri variable R Scuti

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..211l&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Apr.-May 1981, p. 211-220.

Astronomy and Astrophysics

Astronomy

31

Abundance, Line Spectra, Stellar Atmospheres, Stellar Spectra, Variable Stars, Atmospheric Temperature, D Lines, H Alpha Line, Halos, Hydrogen, Iron, Stellar Evolution

Scientific paper

A fine-analysis of the bright RV Tauri-type variable R Scuti is given. The analysis derives from a single high-dispersion echellogram obtained near secondary light minimum. The derived atmospheric parameters at that time were as follows: effective temperature, 4400 K; log g, 0.0; and Fe/H abundance ratio, -0.9. The light metals are present with solar ratios, but the s-process elements are underabundant by factors close to 10. This abundance pattern is strikingly different from that seen in normal halo and old-disk dwarfs and red giants, which exhibit nonsolar s-process abundance ratios only when the Fe/H ratio is less than -2. Several W Virginis variables with only modest iron deficiencies, however, are known to show similar s-process underabundances. The results may indicate that s-process production in the early stages of disk formation was spatially inhomogeneous. If such s-process deficiencies are confined to the RV Tauri and W Virginis variables, however, an alternative hypothesis is that these are highly evolved, hydrogen-deficient halo stars that originally had very low iron contents.

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