| Issue |
EAS Publications Series
Volume 71-72, 2015
The Physics of Evolved Stars: A Conference Dedicated to the Memory of Olivier Chesneau
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|
|---|---|---|
| Page(s) | 169 - 171 | |
| Section | Binaries | |
| DOI | https://doi.org/10.1051/eas/1571037 | |
| Published online | 01 December 2015 | |
E. Lagadec, F. Millour and T. Lanz (eds)
EAS Publications Series, 71–72 (2015) 169-171
Imaging and Spectroscopy of The Massive Binaries MWC 314 and HD 168625
1 Royal Observatory of Belgium, Brussels
2 European Southern Observatory
3 Geneva Observatory, Versoix, Switzerland
e-mail: Alex.Lobel@oma.be; alobel@sdf.org
VLT-NACO imaging and spectroscopic monitoring of MWC 314 shows it is a hierarchical triple system consisting of a close massive binary that contains a Luminous Blue Variable (LBV), and a third companion bound in a wide orbit. We observe Discrete Absorption Components (DACs) in extended violet absorption wings of P Cyg He i lines at orbital phases when the primary is in front of the secondary. The DACs signal fast expanding wind regions of enhanced density and variable outflow velocity. We present a model of the circumbinary disc showing that the formation region of Fe ii emission lines in the disc extends to ∼26 au from the center of gravity for i=70∘. Direct imaging of the candidate LBV HD 168625 also reveals a companion bound in a wide orbit. A kinematic analysis of VLT-UVES slit spectra signals significantly different radial velocities of the [N ii] λ6584 emission line formation regions N-S across the inner loop-like nebular structures.
© EAS, EDP Sciences, 2015