Akademik Veri Yönetim Sistemi
Turkish Journal of Astronomy & Astrophysics, cilt.3, sa.3, ss.88-92, 2022 (Hakemli Dergi)
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 (DAO) with R = 67000 and S/N values 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 (R = 80000) Chiron échelle spectrograms now being obtained with the 1.5-m telescope
at Cerro Tololo Inter-American Observatory in Chile were coadded to achieve high S/N (>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.