Preliminary analysis of light curves of the seven carbon stars

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Authors

DUŠEK Jiří MIKULÁŠEK Zdeněk

Year of publication 2003
Type Article in Periodical
Magazine / Source Contributions of the Astronomical Observatory Skalnaté Pleso
MU Faculty or unit

Faculty of Science

Citation
Field Astronomy and astrophysics
Keywords AGB stars; carbon stars; individual stars; stellar pulsations; periods; UBV photometry; Hipparcos photometry
Description We present a preliminary analysis of light curves of the following carbon stars: WZ Cas, VY UMa, Y CVn, RY Dra, T Lyr, HK Lyr and TT Cyg, constructed on the basis of our own BV photoelectric observations done at the Brno Observatory in 1979-94 and Hipparcos observations. The analysis suggests that "semiregular" light curves of all studied stars can be faithfully expressed by a superposition of long-term changes and a set of medium-term harmonic variations (possibly pulsations) with periods from 50 to 500 days.
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