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- W2081569598 abstract "The small-amplitude Cepheid SU Cas and four members of the association Cas OB2 (HD 16893, HD 17327a and b, HD 17443) were investigated, using high-resolution CCD spectra. The following results were obtained: 1) All these objects have the same metallicity values, close to that of the Sun; 2) Elemental abundance indicates that SU Cas is a post first dredge-up star with an age from 1 10 to 1.45 10 yr, and it is not crossing the Cepheid instability strip for the first time. The mean value of log g = 2.35 corresponds to pulsations in the fundamental tone, although errors in gravity estimations provide overtone pulsations. The questions about its pulsational mode and membership in Cas OB2 remained open; 3) HD 17327a is a slowly rotating HgMn–star with the highest helium content among such objects, while HD 16893 also has a manganese overabundance and might be classified as an Am–star; 4) HD 17327b and HD 17443 are rapidly rotating main-sequence stars, while HD 17443 has a helium content comparable with that of the Sun." @default.
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- W2081569598 date "2001-03-01" @default.
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- W2081569598 title "Spectroscopic investigations of classical Cepheids and main-sequence stars in galactic open clusters and associations" @default.
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