Chemical composition of selected double-mode Cepheids and the P_1_/P_0_ - [Fe/H] relation.

Details Chemical composition of selected double-mode Cepheids and the P_1_/P_0_ - [Fe/H] relation. Chemical composition of selected double-mode Cepheids and the P_1_/P_0_ - [Fe/H] relation.

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..108..433a&link_type=abstract

Astronomy and Astrophysics Suppl. 108, 433-440 (1994)

Astronomy and Astrophysics

Astrophysics

10

Stars: Abundances, Stars: Variables: Cepheids, Stars: Ew Sct, Vx Pup, Bq Ser

Scientific paper

We present the results of the detailed spectroscopic investigation of three double-mode Cepheids: EW Sct, VX Pup and BQ Ser. The abundance analysis has shown: (1) Carbon is deficient (the abundance normalized to the iron content with respect to the solar value). (2) This carbon deficiency is accompanied by nitrogen overabundance and normal oxygen content. (3) α - and iron group elements with little exception show solar ratio [M/Fe]. (4) The heavy elements in EW Sct are underabundant. (5) Normal iron abundance for EW Sct ([Fe/H]=-0.08) and metal deficiency for VX Pup ([Fe/H]=-0.39) and BQ Ser ([Fe/H]=-0.36) strongly support the existence of a P_1_/P_0_-metallicity relation, as first discussed in work of Andrievsky et al. (1993).

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