EDP Sciences
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Volume 479, Number 2, February IV 2008
Page(s) 529 - 531
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20066873

A&A 479, 529-531 (2008)
DOI: 10.1051/0004-6361:20066873

Symbiotic star LL Cassiopeiae

L. N. Kondratyeva and E. K. Denissyuk

Fessenkov Astrophysical Institute, Observatory 050020 Almaty, Kazakhstan
    e-mail: kondr@aphi.kz

(Received 5 December 2006 / Accepted 27 November 2007)

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 $\ion{He}{ii}$, [ $\ion{O}{iii}$], $\ion{He}{i}$ and $\ion{H}{i}$. Significant fluctuations of relative intensities of [ $\ion{O}{iii}$], 5007 Å and $\ion{He}{ii}$, 4686 Å 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$^{\rm m}$-3${\fm}$5 are found in the B, V and R bands. They can be ascribed to the pulsations of the cool giant.

Key words: stars: binaries: symbiotic

© ESO 2008