stars: early-type; stars: individual: HD 149404; binaries: close; binaries: eclipsing
Abstract :
[en] Context. HD 149 404 is an evolved non-eclipsing O-star binary that has previously undergone a Roche lobe overflow interaction. <BR /> Aims: Understanding some key properties of the system requires a determination of the orbital inclination and of the dimensions of the components. <BR /> Methods: The BRITE-Heweliusz satellite was used to collect photometric data of HD 149 404. Additional photometry was retrieved from the SMEI archive. These data were analysed using a suite of period search tools. The orbital part of the lightcurve was modelled with the nightfall binary star code. The Gaia-DR2 parallax of HD 149 404 was used to provide additional constraints. <BR /> Results: The periodograms reveal a clear orbital modulation of the lightcurve with a peak-to-peak amplitude near 0.04 mag. The remaining non-orbital part of the variability is consistent with red noise. The lightcurve folded with the orbital period reveals ellipsoidal variations, but no eclipses. The minimum when the secondary star is in inferior conjunction is deeper than the other minimum due to mutual reflection effects between the stars. Combined with the Gaia-DR2 parallaxes, the photometric data indicate an orbital inclination in the range of 23°-31° and a Roche lobe filling factor of the secondary larger than or equal to 0.96. <BR /> Conclusions: The luminosity of the primary star is consistent with its present-day mass, whereas the more evolved secondary appears overluminous for its mass. We confirm that the primary's rotation period is about half the orbital period. Both features most probably stem from the past Roche lobe overflow episode. Based on data collected by the BRITE-Constellation satellite mission, designed, built, launched, operated and supported by the Austrian Research Promotion Agency (FFG), the University of Vienna, the Technical University of Graz, the University of Innsbruck, the Canadian Space Agency (CSA), the University of Toronto Institute for Aerospace Studies (UTIAS), the Foundation for Polish Science & Technology (FNiTP MNiSW), and the National Science Centre (NCN).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauw, Grégor ; Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Pigulski, A.; Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, 51-622, Wrocław, Poland
Nazé, Yaël ; Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
David-Uraz, A.; Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA
Handler, G.; Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716, Warszawa, Poland
Raucq, Françoise ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gosset, Eric ; Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Moffat, A. F. J.; Département de Physique, Université de Montréal, CP 6128, Succ. Centre-Ville, Montréal, PQ, H3C 3J7, Canada
Neiner, C.; LESIA, Observatoire de Paris, Place Jules Janssen, 5, 92195, Meudon, France
Pablo, H.; AAVSO Headquarters, 49 Bay State Rd., Cambridge, MA, 02138, USA
Popowicz, A.; Instytut Automatyki, WydziałAutomatyki Elektroniki i Informatyki, Politechnika Śląska, Akademicka 16, 44-100, Gliwice, Poland
Rucinski, S. M.; Department of Astronomy and Astrophysics, University of Toronto, 50 St. George St., Toronto, Ontario, M5S 3H4, Canada
Wade, G. A.; Department of Physics and Space Science, Royal Military College of Canada, PO Box 17000, Stn Forces, Kingston, Ontario, K7K 7B4, Canada
Weiss, W.; Institute for Astrophysics, University of Vienna, Türkenschanzstraße 17, 1180, Vienna, Austria
Zwintz, K.; Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstrasse 25/8, 6020, Innsbruck, Austria)
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