A&A 433, 1031-1035 (2005)
Metallicity of mono- and multiperiodic Cephei starsJ. Daszynska-Daszkiewicz and E. Niemczura
Astronomical Institute of Wroclaw University, ul. Kopernika 11, 51-622 Wroclaw, Poland
(Received 5 March 2004 / Accepted 2 December 2004)
Analyzing IUE ultraviolet spectra of Cep pulsating stars we noticed that multiperiodic variables have a larger mean metal abundance in the photosphere, [ m/H] , than monoperiodic ones. We apply statistical tests to verify this dichotomy. We obtain that, with a large probability, the multiperiodic Cep stars have greater values of [ m/H] . This result is consistent with the linear non-adiabatic theory of pulsation of early B-type stars.
Key words: stars: abundances -- stars: variables: general -- methods: statistical
© ESO 2005