Ultraviolet Spectrum Variability of BP Tau

Abstract

Results of the ultraviolet IUE archive spectrum of classic T Tauri type star BP Tau had been presented. Spectroscopic parameters of mainly strong emission lines were measured. On the more full massive of measurements of the emission doublet MgII λ2800 Å variability of the intensity with period P=8.275±0.005 days with high confidence level was obtained. Although for two separate series obtained with high time resolution a character of variability is cyclic, for total observations of many lines is not fitted a periodicity. There are some group of lines,intensities of emission lines for its were showed decreasing for more than 10 years time interval. ^M