A&A 433, 1031-1035 (2005)
DOI: 10.1051/0004-6361:20040397

Metallicity of mono- and multiperiodic Cephei stars

J. Daszynska-Daszkiewicz and E. Niemczura

Astronomical Institute of Wroclaw University, ul. Kopernika 11, 51-622 Wroclaw, Poland
    e-mail: daszynska@astro.uni.wroc.pl

(Received 5 March 2004 / Accepted 2 December 2004)

Abstract
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

SIMBAD Objects

© ESO 2005