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HD 172189, a Cluster Member Binary System with a δ Scuti Component in the Field of View of COROT |
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| Authors: | Pedro J Amado Susana Martín-Ruíz Juan Carlos Suárez Armando Arellano Ferro Andrés Moya Ignasi Ribas Ennio Poretti |
| Institution: | (1) European Southern Observatory, Alonso de Cordova, 3107 Santiago 19, Chile;(2) Instituto de Astrofísica de Andalucía, CSIC, Apdo 3004, 18080 Granada, Spain;(3) Observatoire de Paris-Meudon, LESIA, 92195 Meudon, France;(4) Instituto de Astronomía, UNAM, Apdo. 70–264, 04510 Mexico, D.F., Mexico;(5) Institut dEstudis Espacials de Catalunya/CSIC, Campus UAB, Facultat de Ciéncies, Torre C5-parell-2a planta, 08193 Bellaterra, Spain;(6) INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate (LC), Italy |
| Abstract: | 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 ⊙ orbiting with a period of 5.702 d. |
| Keywords: | Stars: Binaries: Eclipsing Stars: Oscillations Stars: Variables: δ Sct Galaxy: Open clusters Association: IC 4756 |
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