Reference : Optical spectroscopy of XMEGA targets in the Carina Nebula - III. The multiple system...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/15965
Optical spectroscopy of XMEGA targets in the Carina Nebula - III. The multiple system Tr 16-104 (â ¡CPD -59° 2603)
English
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
Sana, H. [Institut d'Astrophysique & Géophysique, Université de Liège, 5, Avenue de Cointe, B-4000 Liège, Belgium]
Antokhin, I. I. [Institut d'Astrophysique & Géophysique, Université de Liège, 5, Avenue de Cointe, B-4000 Liège, Belgium]
Morrell, N. I. [Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque, 1900 La Plata, Argentina]
Niemela, V. S. [Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque, 1900 La Plata, Argentina]
Albacete Colombo, J. F. [Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque, 1900 La Plata, Argentina]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Vreux, Jean-Marie [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > > ]
1-Sep-2001
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
326
1149-1160
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] BINARIES: CLOSE ; BINARIES: SPECTROSCOPIC ; STARS: EARLY-TYPE ; STARS: FUNDAMENTAL PARAMETERS ; STARS: INDIVIDUAL: TR 16-104 ; OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: TRUMPLER 16
[en] We discuss the orbital elements of the multiple system Tr 16-104 which is usually believed to be a member of the open cluster Trumpler 16 in the Carina complex. We show that Tr 16-104 could be a hierarchical triple system consisting of a short-period (2.15d) eclipsing O7V+O9.5V binary bound to a B0.2 IV star. Our preliminary orbital solution of the third body indicates that the B star most probably describes an eccentric orbit with a period of ~285 or ~1341d around the close binary. Folding photometric data from the literature with our new ephemerides, we find that the light curve of the close binary exhibits rather narrow eclipses indicating that the two O stars must be well inside their Roche lobes. Our analysis of the photometric data yields a lower limit on the inclination of the orbit of the close binary of i>=77°. The stellar radii and luminosities of the O7 V and O9.5 V stars are significantly smaller than expected for stars of this spectral type. Our results suggest that Tr 16-104 lies at a distance of the order of 2.5kpc and support a fainter absolute magnitude for zero-age main-sequence O stars than usually adopted. We find that the dynamical configuration of Tr 16-104 corresponds to a hierarchical system that should remain stable provided that it suffers no strong perturbation. Finally, we also report long-term temporal variations of high-velocity interstellar Caii absorptions in the line of sight towards Tr 16-104.
http://hdl.handle.net/2268/15965
10.1046/j.1365-8711.2001.04681.x
http://adsabs.harvard.edu/abs/2001MNRAS.326.1149R

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