Metallicity of mono- and multiperiodic Cephei stars
Astronomical Institute of Wrocław University, ul. Kopernika 11, 51-622 Wrocław, Poland e-mail: email@example.com
Accepted: 2 December 2004
Analyzing IUE ultraviolet spectra of β 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 β 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