Spectral observations of stars with exocomet activity

Comets are small icy bodies of the Solar System that evaporate and outgas as they approach the Sun. In the Solar System several thousand comets were detected in all ever carried out astronomical observations. The Kuiper Belt and the Oort Cloud may contain trillions of such frozen bodies. A definite answer about their origin and evolution is not given. Other planetary systems may contain comets as well as the Solar System. At present, the search and study of exocomets is focused on the study of young (< 50 million years) stars of spectral type A. It is believed that exocomets form and evolve like comets in the Solar System. Within the framework of comet and exocomet activity studies, we have carried out high-resolution spectral observations of three young stars (HD217782, HD21620, HD110411). In this paper, using spectral observations of the HD110411 star and the Ca II line (3933Å) as an example, we consider a simplified data processing technique for detecting exocomet act!

ivity.