A More Powerful Approach For Studying the Abundances of Chemically Peculiar Stars

Authors : Kutluay YÜCE

Pages : 88-92

Doi:10.55064/tjaa.1098538

View : 8 | Download : 6

Publication Date : 2022-12-31

Article Type : Research Paper

Abstract :We investigate those stars in which convection and then radiation transports energy from their cores to their envelopes and atmospheres. In our previous generation of stellar analyses, we used the spectroscopic technique of fine analysis with optical region spectra mainly from the Dominion Astrophysical Observatory insert ignore into journalissuearticles values(DAO); with R = 67000 and S/N values were close to 200 to obtain the elemental abundances of non-magnetic, solar-composition and peculiar B, A, and early F-stars and differential Strömgren photometry of the magnetic chemically peculiar stars from the Four College Automated Telescope. Our new analyses of high-dispersion insert ignore into journalissuearticles values(R = 80000); Chiron échelle spectrograms now being obtained with the 1.5-m telescope at Cerro Tololo Interamerican Observatory in Chile were coadded to achieve high S/N insert ignore into journalissuearticles values(>500); are beginning to enable us to study in much greater detail many properties of these stars. For example, it should be possible to investigate in greater detail the abundance differences between stars. Studies of peculiar A stars might reveal the effects of non-solar abundances on their stellar evolution. It is important to determine how homogeneous with distance from the stellar centers are the chemical compositions of these stars which might be seen in their photometric variability. We summarize the abundance studies of chemically peculiar stars putting their results into the broader context of stellar evolution.
Keywords : techniques spectroscopy, star chemically peculiar, stars abundances