HAL : in2p3-00454415, version 1

Code Bibliographique ADS : 2009A&A...507..901C

DOI : 10.1051/0004-6361/200912551

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Astronomy and Astrophysics 507 (2009) 901-910

HD 172189: another step in furnishing one of the best laboratories known for asteroseismic studies

O. L. Creevey, K. Uytterhoeven 1, S. Martín-Ruiz, P. J. Amado, E. Niemczura, H. Van Winckel 2, J. C. Suárez 3, A. Rolland 3, F. Rodler, C. Rodríguez-López 4, E. Rodríguez 5, G. Raskin 2, M. Rainer, E. Poretti 6, P. Pallé, R. Molina, A. Moya 7, P. Mathias 8, L. Le Guillou 2, 9, P. Hadrava, D. Fabbian, R. Garrido 3, L. Decin 2, G. Cutispoto, V. Casanova, E. Broeders 2, A. Arellano Ferro, F. Aceituno

(11/2009)

HD 172189 is a spectroscopic eclipsing binary system with a rapidly-rotating pulsating δ Scuti component. It is also a member of the open cluster IC 4756. These combined characteristics make it an excellent laboratory for asteroseismic studies. To date, HD 172189 has been analysed in detail photometrically but not spectroscopically. For this reason we have compiled a set of spectroscopic data to determine the absolute and atmospheric parameters of the components. We determined the radial velocities (RV) of both components using four different techniques. We disentangled the binary spectra using KOREL, and performed the first abundance analysis on both disentangled spectra. By combining the spectroscopic results and the photometric data, we obtained the component masses, 1.8 and 1.7 Mȯ, and radii, 4.0 and 2.4 Rȯ, for inclination i = 73.2°, eccentricity e = 0.28, and orbital period Π = 5.70198 days. Effective temperatures of 7600 K and 8100 K were also determined. The measured v sin i are 78 and 74 km s-1, respectively, giving rotational periods of 2.50 and 1.55 days for the components. The abundance analysis shows [Fe/H] = -0.28 for the primary (pulsating) star, consistent with observations of IC 4756. We also present an assessment of the different analysis techniques used to obtain the RVs and the global parameters.

1 :	Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) (IRFU)
	CEA : DSM/IRFU
2 :	Instituut voor Sterrenkunde
	Faculteit Wetenschappen
3 :	Instituto de Astrofísica de Andalucía (IAA)
	Consejo Superior de Investigación Científica
4 :	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)
	CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III
5 :	GOA-UVA Atmospheric Optics Group of the University of Valladolid
	GOA-UVA Atmospheric Optics Group of the University of Valladolid
6 :	Osservatorio Astronomico di Brera
	INAF
7 :	Institut Cavanilles de Biodiversitat i Biologia Evolutiva (ICBiBE)
	Universitat de València
8 :	Laboratoire Hippolyte Fizeau (FIZEAU)
	Université Nice Sophia Antipolis [UNS] – CNRS : UMR6525 – Observatoire de la Côte d'Azur – INSU
9 :	Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE)
	CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot

Thème(s)

:

Planète et Univers/Astrophysique/Astrophysique stellaire et solaire Physique/Astrophysique/Astrophysique stellaire et solaire

Mot(s)-clé(s) : stars: binaries: spectroscopic – stars: fundamental parameters – stars: oscillations – stars: variables: δ Sct – stars: abundances – Galaxy: open clusters and associations: individual: IC 4756

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Contributeur : Laurent Le Guillou <>

Soumis le : Lundi 8 Février 2010, 15:54:32

Dernière modification le : Lundi 8 Février 2010, 16:20:13