Long Term UV Continuum and Line Variability in NGC 1275

In this paper, we present our results for the first time on long term emission-line and continuum variability studies using the International Ultraviolet Explorer’s final archive of UV spectroscopic data obtained in the wavelength region from 1150 A to 3200 A for NGC 1275, a dust dominated BL Lac characterized by the Rmax and  F-variance parameter. The UV continuum flux variability analysis presented in this paper covers more number of emission-line free continuum windows in the UV region centred at  1710 A, 1800 A, 2625 A, 2875 A & 3025 A. We have obtained a higher value of Fvar  ~ 45 % at 1710 A and a lower value of ~ 30 % at 1800 A for the IUE's observational period of 1978 - 1989. The Lyα, C IV, C III] and Mg II emission lines have been observed as weaker line features on fewer occasions intermittently.