X-shooter, NACO, and AMBER observations of the LBV Pistol Star
Christophe Martayan
(1, 2, 3)
,
Ronny Blomme
(4)
,
Jean-Baptiste Le Bouquin
(5)
,
Antoine Merand
(1)
,
Guillaume Montagnier
(1)
,
Fernando Selman
(1)
,
J. H. V. Girard
(1)
,
A. Fox
(1)
,
Dietrich Baade
(6)
,
Yves Frémat
(4)
,
Alex Lobel
(4)
,
Fabrice Martins
(7)
,
Fabien Patru
(1)
,
Thomas Rivinius
(1)
,
Hugues Sana
(8)
,
Stanislav Stefl
(1)
,
Juan Zorec
(9)
,
Thierry Semaan
(2, 3)
1
ESO -
European Southern Observatory [Santiago]
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 Physique stellaire et galactique
4 ROB - Royal Observatory of Belgium = Observatoire Royal de Belgique
5 LAOG - Laboratoire d'Astrophysique de Grenoble
6 ESO - European Southern Observatory
7 GRAAL - Groupe de Recherches Autrichiennes et Allemandes. UHB
8 University of Amsterdam
9 IAP - Institut d'Astrophysique de Paris
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 Physique stellaire et galactique
4 ROB - Royal Observatory of Belgium = Observatoire Royal de Belgique
5 LAOG - Laboratoire d'Astrophysique de Grenoble
6 ESO - European Southern Observatory
7 GRAAL - Groupe de Recherches Autrichiennes et Allemandes. UHB
8 University of Amsterdam
9 IAP - Institut d'Astrophysique de Paris
Fabrice Martins
- Fonction : Auteur
- PersonId : 171832
- IdHAL : fabrice-martins
- ORCID : 0000-0001-5496-4567
- IdRef : 08409141X
Résumé
We present multi-instrument and multi-wavelength observations of the famous LBV star Pistol Star. These observations are part of a larger program on early O stars at different metallicities. The Pistol Star has been claimed to be one of the most massive star known, with 250 solar masses. We present preliminary results based on X-shooter spectra, as well as observations performed with the VLTI-AMBER and the VLT-NACO adaptive optics. The X-shooter spectrograph provides simultaneously a spectrum from the UV to the K-band with a resolving power of ˜15000. The preliminary results obtained indicate that Pistol Star has similar properties to eta Car, including shells of matter, but is also a binary.