Abundances and radial velocity analysis of BW Vulpeculae

Details Abundances and radial velocity analysis of BW Vulpeculae Abundances and radial velocity analysis of BW Vulpeculae

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...408.1077s&link_type=abstract

Astronomy and Astrophysics, v.408, p.1077-1086 (2003)

Astronomy and Astrophysics

Astrophysics

5

Stars: Abundances, Stars: Individual: Bw Vulpeculae, Stars: Oscillations, Stars: Variables: Cepheids

Scientific paper

We present the results of the analysis of 56 échelle spectra of the beta 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, v sin i, 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.
Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

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