Fundamental parameters of Ap-star HD 108662

TL;DR

This paper conducts a detailed spectroscopic analysis of the Ap-star HD 108662, determining its fundamental parameters, chemical abundances, and magnetic field effects using high and low resolution spectra.

Contribution

It provides a self-consistent analysis incorporating magnetic effects and stratification, offering new detailed elemental abundances and fundamental parameters for HD 108662.

Findings

Derived effective temperature of 10212 K

Measured magnetic field strength of 3300 G

Determined chemical stratification and homogeneity for Fe and Cr

Abstract

We present the results of a self-consistent spectroscopic analysis of the atmosphere of Ap-star HD 108662 based on high resolution spectrum and low resolution spectrophotometric observations. Magnetic field effects, such as Zeeman broadening and polarized line formation, were taking into account in the analysis of spectral line profiles. We derived abundances of 24 chemical elements as well as the stratification of Fe -- an element which is the main contributor to the line absorption in the visible wavelengths. Another abundant chemical element -- Chromium -- was found to be distributed homogeneously in the atmosphere of the star. From our analysis we determined the following fundamental parameters of HD~108662: $T_{eff}$ = 10212 K, log$g$ = 4.0, $R/R_{\odot}$ = 2.09 and log$(L/L_{\odot})$ = 1.63. The estimated rotational velocity of the star is $v\,sini$ = 20.4 km/s and the strength of the surface magnetic field is $B_s$ = 3300 G.