# High-resolution Spectroscopy and Spectropolarimetry of Selected Delta Scuti Pulsating Variables

## TL;DR

This study combines high-resolution spectroscopy and spectropolarimetry to analyze Am stars, revealing their evolutionary status, chemical peculiarities, and negligible magnetic fields, contributing to understanding their physical properties.

## Contribution

It provides detailed atmospheric parameters, chemical abundances, and magnetic field measurements of Am stars, enhancing knowledge of their evolution and peculiarities.

## Key findings

- Stars are evolved from ZAMS towards TAMS within the δ Sct instability strip.
- Light elements like Ca and Sc are underabundant, while iron-peak elements are overabundant.
- Magnetic fields in all studied stars are negligible, supporting their classification as Am stars.

## Abstract

The combination of photometry, spectroscopy and spectropolarimetry of the chemically peculiar stars often aims to study the complex physical phenomena such as stellar pulsation, chemical inhomogeneity, magnetic field and their interplay with stellar atmosphere and circumstellar environment. The prime objective of the present study is to determine the atmospheric parameters of a set of Am stars to understand their evolutionary status. Atmospheric abundances and basic parameters are determined using full spectrum fitting technique by comparing the high-resolution spectra to the synthetic spectra. To know the evolutionary status we derive the effective temperature and luminosity from different methods and compare them with the literature. The location of these stars in the H-R diagram demonstrate that all the sample stars are evolved from the Zero-Age-Main-Sequence towards Terminal-Age-Main-Sequence and occupy the region of $\delta$ Sct instability strip. The abundance analysis shows that the light elements e.g. Ca and Sc are underabundant while iron peak elements such as Ba, Ce etc. are overabundant and these chemical properties are typical for Am stars. The results obtained from the spectropolarimetric analysis shows that the longitudinal magnetic fields in all the studied stars are negligible that gives further support their Am class of peculiarity.