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Issue A&A Volume 408, Number 3, September IV 2003 Page(s) 1077 - 1086 Section Formation and evolution of planetary systems DOI 10.1051/0004-6361:20031005

A&A 408, 1077-1086 (2003)
DOI: 10.1051/0004-6361:20031005

Abundances and radial velocity analysis of BW Vulpeculae

A. Stankov¹, I. Ilyin² and C. V. M. Fridlund<sup>1

1</sup>  SCI-SA, Research and Scientific Support Department of ESA, ESTEC, 2200 AG Noordwijk, The Netherlands
    e-mail: Malcolm.Fridlund@esa.int
²  Astronomy Division, PO Box 3000, 90014 University of Oulu, Finland
    e-mail: ilya.ilyin@oulu.fi

(Received 12 March 2003 / Accepted 10 June 2003)

Abstract
We present the results of the analysis of 56 échelle spectra of the  Cephei star BW Vulpeculae. The data were obtained during three nights with the SOFIN spectrograph at the Nordic Optical Telescope and cover a wavelength range from 3650 Å to 7340 Å. We compare the observed spectrum with a synthetic spectrum calculated from a model atmosphere for this star utilizing the program ATLAS9 by Kurucz. From this, we determine a projected rotational velocity, , of 24 km s ^-1.

Detailed spectral line identification and an abundance analysis for this star are performed. From these analyses we find that Ne, Si, He, and Ar are over-abundant in BW Vulpeculae, while the abundances for N, S, O, Fe, C, and Al are solar.

Finally, a comparison of radial velocity curves from six different layers of BW Vulpeculae's atmosphere is presented, corresponding to the formation depths of different elements. We show that at least six of these layers move independently from each other.

Key words: stars: abundances -- stars: individual: BW Vulpeculae -- stars: oscillations -- stars: variables: Cepheids

Offprint request: A. Stankov, Anamarija.Stankov@esa.int

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