Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ap%26ss.304..173a&link_type=abstract
Astrophysics and Space Science, Volume 304, Issue 1-4, pp. 173-175
Astronomy and Astrophysics
Astrophysics
2
Stars: Binaries: Eclipsing, Stars: Oscillations, Stars: Variables: &Delta, Sct, Galaxy: Open Clusters, Association: Ic 4756
Scientific paper
Photometric and spectroscopic results for the star HD 172189, member of the open cluster IC 4756 in the summer field of the space mission COROT, are presented. From photometric observations in the Strömgren system carried out at various epochs, its binary nature as well as the presence of a δ Scuti-type pulsating component have been discovered. The frequency analysis of the whole dataset confirms a dominant frequency of 19.5974 c d-1 with a maximum amplitude near 0.02 mag plus other frequencies in the range 18 20 c d-1. A preliminary orbital solution from the light curve and from four FEROS spectra reveals two similar components of around 1.5 M &sun; orbiting with a period of 5.702 d.
Amado Pedro J.
Arellano Ferro Armando
Martín-Ruíz Susana
Moya Andres
Poretti Ennio
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