Abstract
We present a survey of the most important results obtained in observations with the 6-m telescope in the studies of magnetic fields of chemically peculiar stars. It is shown that we have found more than 200 new magnetic chemically peculiar stars, which is more than 30% of their total known number. Observations of ultra-slow rotators (stars with rotation periods of years and decades) have shown that there are objects with strong fields among them, several kG in magnitude. In the association of young stars in Orion, it has been found that the occurrence and strength of magnetic fields of chemically peculiar stars decrease sharply with age in the interval from 2 to 10 Myr. These data indicate the fossil nature of magnetic fields of chemically peculiar stars. About 10 magnetic stars were found based on ultra-accurate photometry data obtained from the Kepler and TESS satellites. A new effective method of searching for magnetic stars was developed. In addition, the exact rotation periods make it possible to build reliable curves of the longitudinal field component variability with the phase of the star’s rotation period, and hence to create its magnetic model. The survey is dedicated to the memory of Prof. Yuri Nikolaevich Gnedin.
Highlights
We present a survey of the most important results obtained in observations with the 6-m telescope in the studies of magnetic fields of chemically peculiar stars
The paper by Romanyuk et al [120] presents the results of measurements of the magnetic field of 8 chemically peculiar (CP) stars and one candidate from the Kepler field obtained with the spectropolarimeter of the 6-m telescope
We demonstrate that the 6-m telescope has been carrying out intense observations of stars of different types for the last 40 years
Summary
The study of stellar magnetism is one of the most important areas of research in modern observational astrophysics. The nature of formation of the stellar global magnetic field is completely different These are not atmospheric phenomena; they are the result of overall processes occurring in the entire star. To solve the problem of the large-scale magnetic field formation, it is necessary to find such objects, where global, but strong, fields are observed. Such objects exist: chemically peculiar (CP) stars. It became possible to obtain high-accuracy polarized profiles of spectral lines with details corresponding to the spots of chemical abundance This made it possible to analyze the line profiles and develop methods of the Doppler and magnetic imaging [13,14] of chemically peculiar stars. More information on the history and methods of magnetic field measurements can be found in the series of papers by Romanyuk [15,16,17]
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