Nature of light variations in the symbiotic binary V417 Cen

摘要

V417 Cen is a D'-type symbiotic system surrounded by a faint, extendedasymmetric nebula. Optical photometric observations of this object cover last20 years. They show strong long term modulation with a period of about 1700days and amplitude about 1.5 mag in V band, in addition to variations withshorter times-scales and much lower amplitudes. In this presentation we discusspossible reasons of these variations.