Stellar Variability with Photometric and Spectroscopic Analysis of five Am Field Stars

TL;DR

This study combines photometric and spectroscopic analysis of five Am stars, revealing pulsation variability, elemental abundance differences, and stellar parameters, with implications for stellar evolution and habitability zones.

Contribution

It provides new observational data on pulsations and elemental abundances of Am stars, along with stellar parameters and habitability zone calculations.

Findings

HD 98851 and HD 207561 show pulsation periods of 1.55 hr and 5.8 min.

HD 73045 exhibits likely pulsation with a 36-min period.

Stellar masses are greater than solar mass in asteroseismic analysis.

Abstract

The spectroscopic and photometric analysis of sample Am stars are carried out to determine the stellar characteristics of each studied star. The CCD photometric analysis of HD 98851 and HD 207561 show clear evidence of pulsation variability of 1.55 hr and 5.8 min respectively. Similarly, a clear evidence of the photometric variability is also found for an Am star HD 73045 which is likely to be pulsating in nature with a period of about 36-min. We are also found dissimilar behaviour of elemental abundances of various ions for HD 113878 and HD 118660. The basic stellar parameters (mass, luminosity, radius, life time, distance, proper-motion etc.) are determined for each sample stars. The tidal radius and boundaries of habitable zone of each star are also computed to search the extra-terrestrial life. Asteroseismic mass scale test shows greater stellar masses compare to the solar mass.