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| Paper: |
On the Binarity of LBV Stars |
| Volume: |
464, Circumstellar Dynamics at High Resolution |
| Page: |
293 |
| Authors: |
Martayan, C.; Lobel, A.; Baade, D.; Blomme, R.; Frémat, Y.; LeBouquin, J.-B.; Selman, F.; Girard, J.; Mérand, A.; Montagnier, G.; Patru, F.; Mawet, D.; Martins, F.; Rivinius, Th.; Štefl, S.; Zorec, J.; Semaan, T.; Mehner, A.; Kervella, P.; Sana, H.; Schödel, R. |
| Abstract: |
We report on the binarity of luminous blue variable stars observed with a set
of techniques and instruments. Among them, observations at high angular
resolution with the VLT-NACO, the VLTI-AMBER and with spectrographs such as
the VLT-XSHOOTER allowed us to find several LBV stars as binaries or having a
potential companion. In particular the LBV Pistol Star clearly presents
radial velocity variations and line profiles modifications (double peak
appearance). In addition, the absorption component of the P Cygni lines varies
as well with the time indicating a potential wind structure variability. Our
observations also show directly for the first time a companion to at least one
of the observed LBVs (HD 168625). This one seems to affect the environment
of the system. This system is known to be surrounded by several rings similar
to those of SN1987A, possibly indicating a future supernova occurrence for
this Galactic object. These results show that Eta Car is no longer unique. |
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