Optical Spectroscopy of a post-AGB star HD 187885

Abstract

The physical parameters of the atmosphere and its chemical composition for a post-AGB star HD 187885 are determined from high resolution spectra. The effective temperature Teff = 8000 ± 200 K and the surface gravity log g = 1.0 ± 0.3 were derived. The star was found to be metal-deficient with [Fe/H] = −0.51. The α-elements, except of Ca and Ti, and the s-process elements are overabundant. These results partly confirm and supplement the data available in the literature. The spectrum shows many circumstellar lines formed in the multiple expanding shells. Numerous diffuse interstellar bands seen in the spectra may also originate in the same shells.

Keywords

• stars: atmospheres
• stars: individual: hd 187885