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On the Binarity of LBV Stars

Martayan, C. and Lobel, A. and Baade, D. and Blomme, R. and Frémat, Y. and LeBouquin, J.-B. and Selman, F. and Girard, J. and Mérand, A. and Montagnier, G. and Patru, F. and Mawet, D. and Martins, F. and Rivinius, Th. and Štefl, S. and Zorec, J. and Semaan, T. and Mehner, A. and Kervella, P. and Sana, H. and Schödel, R. (2012) On the Binarity of LBV Stars. In: Circumstellar Dynamics at High Resolution. ASP Conference Series. No.464. Astronomical Society of the Pacific , San Francisco, CA, pp. 293-330. ISBN 978-1-58381-810-7.

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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.

Item Type:Book Section
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URLURL TypeDescription
Girard, J.0000-0001-8627-0404
Mawet, D.0000-0002-8895-4735
Mehner, A.0000-0002-9564-3302
Kervella, P.0000-0003-0626-1749
Additional Information:© 2012 Astronomical Society of the Pacific. Observations were carried out under GTO program ID 085.D-0125(A), normal program IDs 085.D-0625(A,B,C), 087.D-0426(A to G). CMa is grateful to ESO colleagues (astronomers, telescope operators, engineers) for their help in this study. This research has made use of the Simbad and Vizier databases maintained at CDS, Strasbourg, France.
Series Name:ASP Conference Series
Issue or Number:464
Record Number:CaltechAUTHORS:20150519-101639222
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Official Citation:On the Binarity of LBV Stars Volume: 464, Circumstellar Dynamics at High Resolution Page: 293-330 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.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57651
Deposited On:19 May 2015 18:04
Last Modified:09 Mar 2020 13:18

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