delta Cen: a new binary Be star detected by VLTI/AMBER spectro-interferometry - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2008

delta Cen: a new binary Be star detected by VLTI/AMBER spectro-interferometry

Anthony Meilland
  • Fonction : Auteur
  • PersonId : 852560
Florentin Millour
Philippe Stee
R. G. Petrov

Résumé

Aims. We studied the Be star δ Cen circumstellar disk using long-baseline interferometry which is the only observing technique able to resolve simultaneously, spatially and spectroscopically objects smaller than 5 mas in the H and K band. Methods. We used the VLTI/AMBER instrument on January 6, 8, and 9, 2008, in the H and K bands combining Low (35) and Medium (1500) spectral resolution observations. Results. We detected an oscillation in the visibility curve as a function of the spatial frequency which is a clear signature for a companion around δ Cen. Our best fit leads us to a binary separation of 68.7 mas, a companion flux contribution in the K band of about 7% of the total flux, a PA of 117.5 ◦ and an envelope flux around the Be primary contributing to about 50 % of the total flux, in agreement with our Spectral Energy Distribution (SED) fit. The envelope size is estimated to be 1.6 mas in K but no departure from the spherical symmetry was detected.
Fichier principal
Vignette du fichier
del_Cen12.pdf (188.93 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00307590 , version 1 (29-07-2008)
hal-00307590 , version 2 (07-08-2008)

Identifiants

Citer

Anthony Meilland, Florentin Millour, Philippe Stee, Alain Spang, R. G. Petrov, et al.. delta Cen: a new binary Be star detected by VLTI/AMBER spectro-interferometry. 2008. ⟨hal-00307590v1⟩
252 Consultations
94 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More