Search academic texts

Information × Registration Number 0212U006200, 0109U008872 , R & D reports Title Young stars and their circumstellar environment popup.stage_title Head Petrov Petr Petrovich, Registration Date 01-03-2012 Organization Scientific-research institute "Crimean asrophysical observatory" popup.description2 Luminosities, radii, masses and ages of 88 young X-ray active stars in star-forming region of Tau-Aur are determined. It is shown that about 33% of the stars have an age of at least 10 million years. It is found that magnetic accretion of matter onto the surface of young stars leads to the formation of not only hot photospheric spots, but also changes the structure of the chromospheric layers in the region surrounding the accretion column, i.e, accretion of matter is an additional mechanism of chromospheric heating of young stars. It is shown that flux variations in UX Ori-type stars are caused by instabilities in the innermost regions of the gaseous dusty accretion disks and that the variations in the NIR spectrum are caused not only by dust, but also by the gaseous component of the circumstellar disk. Unusual periodic eclipses repeating every 13.9 years were discovered in star WW Wul, which may be due to peculiar properties of accretion disk of a secondary component. It is shown that deep minimum of RW Aur was caused by obscuration of the star by a dusty cloud, and that the magnetic field lines in the cloud are parallel to the jet, which corresponds to the poloidal magnetic field configuration. Cyclic variations in emission lines in the spectrum of AB Aur were found, with a characteristic time of about 120 days, which may be caused by the periodic rearrangement of stellar magnetosphere. Analysis of photometric observations of more than 2000 young stars in the cluster h and X Persei was accomplished. Product Description popup.authors Антонюк К.А. Артєменко С.О. Бєлан С.М. Блінов О.О. Гранкін К.М. Козлова О.В. Махин О.М. Піть М.В. Панков М.Ф. Петров П.П. Ростопчина-Шаховська А.М. Стулін В.В. Таран О.В. Філатова Л.І. Шітов В.Г. Шаповаленко В.З. Шаховськой Д.М. popup.nrat_date 2020-04-02 Close