Coordinated monitoring of the eccentric O-star binary Iota Orionis: optical spectroscopy and photometry
English
Marchenko, Sergey V[Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada]
Rauw, Grégor[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
Antokhina, Eleonora A[Moscow State University, Sternberg State Astronomical Institute, Universitetskij Prospect 13, 119899, Moscow, Russia]
Antokhin, Igor I[Moscow State University, Sternberg State Astronomical Institute, Universitetskij Prospect 13, 119899, Moscow, Russia]
Ballereau, Dominique[Observatoire de Paris-Meudon, DASGAL/UMR 8633, F-92125 Meudon Principal Cedex, France]
Chauville, Jacques[Observatoire de Paris-Meudon, DASGAL/UMR 8633, F-92125 Meudon Principal Cedex, France]
Corcoran, Michael F[Universities Space Research Association/Laboratory for High Energy Astrophysics, GSFC, Greenbelt, MD 20771, USA]
Costero, Rafael[Instituto de Astronomía, Universidad Nacional Autónoma de México, J. J. Tablada 1006, Colonia Lomas de Santa Maria, 58090 Morelia, Michoacán, Mexico]
Echevarria, Juan[Instituto de Astronomía, Universidad Nacional Autónoma de México, J. J. Tablada 1006, Colonia Lomas de Santa Maria, 58090 Morelia, Michoacán, Mexico]
Eversberg, Thomas[Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada]
Gayley, Ken G[University of Iowa, 203 van Allen Hall, Iowa City, IA 52245, USA]
Koenigsberger, Gloria[Instituto de Astronomía, Universidad Nacional Autónoma de México, J. J. Tablada 1006, Colonia Lomas de Santa Maria, 58090 Morelia, Michoacán, Mexico]
Moffat, Anthony F J[Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada]
Morrell, Nidia I[Observatorio de La Plata, 1900 La Plata, Argentina]
Morrison, Nancy D[Ritter Observatory, The University of Toledo, Toledo, OH 43606]
[en] BINARIES: GENERAL ; STARS: EARLY-TYPE ; STARS: GENERAL ; STARS: INDIVIDUAL: IOTA ORIONIS
[en] With the objective of investigating the wind-wind collision phenomenon and supporting contemporaneous X-ray observations, we have organized a large-scale, coordinated optical monitoring campaign of the massive, highly eccentric O9III+B1III binary Iota Orionis. Successfully separating the spectra of the components, we refine the orbital elements and confirm the rapid apsidal motion in the system. We also see strong interaction between the components during periastron passage and detect phase-locked variability in the spectrum of the secondary star. However, we find no unambiguous signs of the bow shock crashing on the surface of the secondary, despite the predictions of hydrodynamic simulations. Combining all available photometric data, we find rapid, phase-locked variations and model them numerically, thus restricting the orbital inclination to 50°<~i<~70°.
[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
