Reference : Resolved astrometric orbits of ten O-type binaries
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/204935
Resolved astrometric orbits of ten O-type binaries
English
Le Bouquin, J.-B. [> >]
Sana, H. [> >]
Gosset, Eric mailto [Université de Liège > > Groupe d'astrophysique des hautes énergies (GAPHE) >]
De Becker, Michaël mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Duvert, G. [> >]
Absil, Olivier mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Anthonioz, F. [> >]
Berger, J.-P. [> >]
Ertel, S. [> >]
Grellmann, R. [> >]
Guieu, S. [> >]
Kervella, P. [> >]
Rabus, M. [> >]
Willson, M. [> >]
25-Apr-2017
Astronomy and Astrophysics
EDP Sciences
601
A34
Yes
International
0004-6361
1432-0746
Les Ulis
France
[en] Stars: massive ; Binaries: general ; Methods: observational ; Techniques: high angular resolution
[en] Our long term aim is to derive model-independent stellar masses and distances for long period massive binaries by combining apparent astrometric orbit with double-lined radial velocity amplitudes (SB2). We follow-up ten O+O binaries with AMBER, PIONIER and GRAVITY at the VLTI. Here, we report about 130 astrometric observations over the last 7 years. We combine this dataset with distance estimates to compute the total mass of the systems. We also compute preliminary individual component masses for the five systems with available SB2 radial velocities. Nine over the ten binaries have their three dimensional orbit well constrained. Four of them are known colliding wind, non-thermal radio emitters, and thus constitute valuable targets for future high angular resolution radio imaging. Two binaries break the correlation between period and eccentricity tentatively observed in previous studies. It suggests either that massive star formation produce a wide range of systems, or that several binary formation mechanisms are at play. Finally, we found that the use of existing SB2 radial velocity amplitudes can lead to unrealistic masses and distances. If not understood, the biases in radial velocity amplitudes will represent an intrinsic limitation for estimating dynamical masses from SB2+interferometry or SB2+Gaia. Nevertheless, our results can be combined with future Gaia astrometry to measure the dynamical masses and distances of the individual components with an accuracy of 5 to 15\%, completely independently of the radial velocities.
Researchers
http://hdl.handle.net/2268/204935
10.1051/0004-6361/201629260
http://adsabs.harvard.edu/abs/2016arXiv160803525L
http://www.aanda.org/articles/aa/abs/2017/05/aa29260-16/aa29260-16.html - Copyright ESO 2017, published by EDP Sciences

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
aa29260-16.pdfPublisher postprint2.06 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.