Fundamental parameters of 8 Am stars: comparing observations with theory

Abstract

In this paper we present a detailed analysis of a sample of eight Am stars, four of them are in the {\it Kepler} field of view. We derive fundamental parameters for all observed stars, effective temperature, gravity, rotational and radial velocities, and chemical abundances by spectral synthesis method. Further, to place these stars in the HR diagram, we computed their luminosity. Two objects among our sample, namely HD\,114839 and HD\,179458 do not present the typical characteristic of Am stars, while for the others six we confirm their nature. The behavior of lithium abundance as a function of the temperature with respect the normal A-type stars has been also investigated, we do not find any difference between metallic and normal A stars. All the pulsating Am stars present in our sample (five out of eight) lies in the $\delta$~Sct instability strip, close to the red edge.

13 pages, 4 figures. Accepted for publication on MNRAS

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• Metallic-Line Stars Identified from Low Resolution Spectra of LAMOST DR5
• Metal-Rich RRc stars in the Carnegie RR Lyrae Survey
• High-resolution Spectroscopy and Spectropolarimetry of Selected Delta Scuti Pulsating Variables
• Rotational Velocities of Am and Non-CP Stars based on Kepler and LAMOST DR5
• A study of Variability of the Marginal Am star HD 176843 observed in the Kepler field
• Photometric and Spectroscopic Analysis of Five Am Stars