High Resolution Echelle Spectroscopy of Two High Proper Motion Stars: HD 102870 and BD+20 3603

Abstract

A chemical abundance analysis is made of two F type high proper motion stars selected from the {\sc ELODIE} library. We use high resolution (R=42\,000) and high signal to noise ratio (S/N=103, 36 $-$per$-$pixel) échelle spectra from the {\sc ELODIE} library of HD\,102870 and BD\,+20\,3603, as two representative F type high proper motion stars, to determine fundamental parameters and photospheric abundances of 16 chemical elements including slow (s)$-$ and rapid (r)$-$process elements from Y to Ba. The chemical composition and kinematic parameters of the stars imply that they belong to different Galactic populations: we report HD\,102870, an IAU standard radial velocity star, to be a thin disk star and BD\,+20\,3603, a metal-poor HPM star, to be a halo star.

19 pages, 8 figures, 2 tables, accepted for publication in New Astronomy