Line synthesis of several chemical elements from carbon to Bismuth in the spectrum of HD 72660

TL;DR

This study uses high-resolution spectra to synthesize and analyze the chemical abundances of multiple elements, including heavy elements like Pt, Pb, and Bi, in the star HD 72660, revealing overabundances likely due to radiative diffusion.

Contribution

First detailed synthesis of multiple chemical elements, especially heavy ones, in HD 72660 using high-resolution spectra and model atmospheres.

Findings

Overabundances of heavy elements like Pt, Pb, and Bi.

Strong overabundances of elements with UV lines.

Evidence of radiative diffusion effects.

Abstract

The high resolution and high $S/N$ HARPS and STIS spectra of the A0Vm star HD72660 have been synthesised using model atmospheres and the line synthesis code Synspec49 in order to derive the abundances of several key chemical elements. In particular we have derived abundances of elements which have their strongest lines in the UV like Ru, Yb, Au, Pb and Bi. We find overabundances of heavy elements in particular strong overabundances of Pt, Pb and Bi which are probably the signature of radiative diffusion in this star.