On the Binarity of LBV Stars
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.
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.Attached Files
Published - 464-0293.pdf
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Additional details
- Eprint ID
- 57651
- Resolver ID
- CaltechAUTHORS:20150519-101639222
- Created
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2015-05-19Created from EPrint's datestamp field
- Updated
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2020-03-09Created from EPrint's last_modified field
- Series Name
- ASP Conference Series
- Series Volume or Issue Number
- 464