Reference : HD 174884: a strongly eccentric, short-period early-type binary system discovered by CoRoT
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/31628
HD 174884: a strongly eccentric, short-period early-type binary system discovered by CoRoT
English
Maceroni, C. mailto [INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio C. (RM), Italy]
Montalban Iglesias, Josefa mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Michel, E. [> >]
Harmanec, P. [Astronomical Institute of the Charles University, Faculty of Mathematics and Physics, V HoleÅ¡oviÄ kách 2, 180 00 Praha 8, Czech Republic]
Prsa, A. [Villanova University, Dept. Astron. Astrophys., 800 E Lancaster Ave., Villanova, PA 19085, USA ; University of Ljubljana, Dept. of Physics, Jadranska 19, 1000 Ljubljana, Slovenia]
Briquet, Maryline mailto [Instituut for Sterrenkunde, K.U. Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium]
Niemczura, E. [Instituut for Sterrenkunde, K.U. Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium ; Astronomical Institute of WrocÅ aw University, ul. Kopernika 11, 51-622 WrocÅ aw, Poland]
Morel, Thierry mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Ladjal, D. [Instituut for Sterrenkunde, K.U. Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium]
Auvergne, M. [Observatoire de Paris, LESIA, UMR 8109, 92195 Meudon, France]
Baglin, A. [Observatoire de Paris, LESIA, UMR 8109, 92195 Meudon, France]
Baudin, F. [Institut d'Astrophysique Spatiale, Campus d'Orsay, 91405 Orsay, France]
Catala, C. [Observatoire de Paris, LESIA, UMR 8109, 92195 Meudon, France]
Samadi, R. [Observatoire de Paris, LESIA, UMR 8109, 92195 Meudon, France]
Aerts, C. [Instituut for Sterrenkunde, K.U. Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium ; Dept. of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands]
1-Dec-2009
Astronomy and Astrophysics
EDP Sciences
508
1375-1389
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] binaries: close ; binaries: eclipsing ; stars: fundamental parameters ; stars: individual: HD 174884 ; stars: variables: general
[en] Accurate photometric CoRoT space observations of a secondary seismological target, HD 174884, led to the discovery that this star is an astrophysically important double-lined eclipsing spectroscopic binary in an eccentric orbit (eË 0.3), unusual for its short 3.65705° orbital period. The high eccentricity, coupled with the orientation of the binary orbit in space, explains the very unusual observed light curve with strongly unequal primary and secondary eclipses having the depth ratio of 1-to-100 in the CoRoT â seismoâ passband. Without the high accuracy of the CoRoT photometry, the secondary eclipse, 1.5 mmag deep, would have gone unnoticed. A spectroscopic follow-up program provided 45 high dispersion spectra. The analysis of the CoRoT light curve was performed with an adapted version of PHOEBE that supports CoRoT passbands. The final solution was obtained by a simultaneous fitting of the light and the radial velocity curves. Individual star spectra were obtained by spectrum disentangling. The uncertainties of the fit were achieved by bootstrap resampling and the solution uniqueness was tested by heuristic scanning. The results provide a consistent picture of the system composed of two late B stars. The Fourier analysis of the light curve fit residuals yields two components, with orbital frequency multiples and an amplitude of ~0.1 mmag, which are tentatively interpreted as tidally induced pulsations. An extensive comparison with theoretical models is carried out by means of the Levenberg-Marquardt minimization technique, and the discrepancy between the models and the derived parameters is discussed. The best fitting models yield a young system age of 125 million years which is consistent with the eccentric orbit and synchronous component rotation at periastron. Based on photometry collected by the CoRoT space mission and spectroscopy obtained with the CORALIE spectrograph attached to the 1.2 m Euler telescope at ESO, La Silla, Chile. The CoRoT space mission was developed and is operated by the French space agency CNES, with participation of ESA's RSSD and Science Programs, Austria, Belgium, Brazil, Germany and Spain. Postdoctoral fellow of the Fund for Scientific Research of Flanders (FWO).
http://hdl.handle.net/2268/31628
10.1051/0004-6361/200913311
http://adsabs.harvard.edu/abs/2009A%26A...508.1375M
http://de.arxiv.org/abs/0910.3513

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