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Title:
CoRoT photometry and high-resolution spectroscopy of the interacting eclipsing binary AU Monocerotis
Authors:
Desmet, M.; Frémat, Y.; Baudin, F.; Harmanec, P.; Lampens, P.; Pacheco, E. Janot; Briquet, M.; Degroote, P.; Neiner, C.; Mathias, P.; Poretti, E.; Rainer, M.; Uytterhoeven, K.; Amado, P. J.; Valtier, J.-C.; Prša, A.; Maceroni, C.; Aerts, C.
Affiliation:
AA(Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium), AB(Royal Observatory of Belgium, 3 Avenue circulaire, B-1180 Brussels, Belgium), AC(Institut d'Astrophysique Spatiale, CNRS/Université Paris XI UMR 8617, 91405 Orsay, France), AD(Astronomical Institute of the Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic), AE(Royal Observatory of Belgium, 3 Avenue circulaire, B-1180 Brussels, Belgium), AF(Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas - IAG, Departamento de Astronomia, Rua do Matão, 1226 - 05508-900 São Paulo, Brazil), AG(Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium), AH(Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium), AI(Observatoire de Paris - Section de Meudon, Place Jules Janssen 5, 92195 Meudon cedex, France), AJ(UNS, CNRS, OCA, Campus Valrose, UMR 6525 H. Fizeau, F-06108 Nice Cedex 2, France), AK(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (LC), Italy), AL(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (LC), Italy), AM(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (LC), Italy; Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot; CEA, IRFU, SAp, Centre de Saclay, F-91191 Gif-sur-Yvette, France), AN(Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain), AO(UNS, CNRS, OCA, Campus Valrose, UMR 6525 H. Fizeau, F-06108 Nice Cedex 2, France), AP(Villanova University, Department Astron. Astrophys., 800 E Lancaster Ave, Villanova, PA 19085, USA; University of Ljubljana, Department of Physics, Jadranska 19, SI-1000 Ljubljana, Slovenia), AQ(Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monteporzio (RM), Italy), AR(Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium; Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlands)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 1, pp. 418-432. (MNRAS Homepage)
Publication Date:
01/2010
Origin:
WILEY
Astronomy Keywords:
accretion, accretion discs, binaries: general, binaries: eclipsing, stars: emission-line, Be, stars: individual: AU Mon
DOI:
10.1111/j.1365-2966.2009.15659.x
Bibliographic Code:
2010MNRAS.401..418D

Abstract

Analyses of very accurate CoRoT space photometry, past Johnson V photoelectric photometry and high-resolution echelle spectra led to the determination of improved and consistent fundamental stellar properties of both components of AU Monocerotis. We derived new, accurate ephemerides for both the orbital motion (with a period of ) and the long-term, overall brightness variation (with a period of ) of this strongly interacting Be + G semi-detached binary. It is shown that this long-term variation must be due to attenuation of the total light by some variable circumbinary material. We derived the binary mass ratio MG/MB = 0.17 +/- 0.03 based on the assumption that the G-type secondary fills its Roche lobe and rotates synchronously. Using this value of the mass ratio as well as the radial velocities of the G-star, we obtained a consistent light curve model and improved estimates of the stellar masses, radii, luminosities and effective temperatures. We demonstrate that the observed lines of the B-type primary may not be of photospheric origin. We also discover rapid and periodic light changes visible in the high-quality residual CoRoT light curves. AU Mon is put into perspective by a comparison with known binaries exhibiting long-term cyclic light changes.

Based on photometry collected by the CoRoT space mission as well as spectroscopy obtained with the FEROS spectrograph attached to the 2.2-m telescope at European Southern Observatory (ESO), La Silla, Chile, under the ESO Large Programme LP178.D-0361, and with the SOPHIE spectrograph of the Observatoire de Haute-Provence (France). The CoRoT space mission was developed and is operated by the French space agency CNES, with the participation of ESA's RSSD and Science Programmes, Austria, Belgium, Brazil, Germany and Spain. Based on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck-Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC).

E-mail: maarten.desmet@ster.kuleuven.be

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