Abstract
Aims. Study of the spectral and photometric properties of the symbiotic star LL Cas. Methods. Spectroscopy and photometry. Results. Spectral and photometric observations of LL Cas were performed in 1986–2006. LL Cas displays a late-type spectrum with TiO absorbtion bands and emission lines of He ii ,[ Oiii], He i and H i. Significant fluctuations of relative intensities of [O iii], 5007 A and He ii, 4686 A are revealed. They reflect the changes of the field of radiation of the ionizing source. Wavelike variations of the star’s light with amplitudes of about 2 m –3. m 5 are found in the B, V and R bands. They can be ascribed to the pulsations of the cool
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