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Pré-Publication, Document De Travail Année : 2008

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

Résumé

Aims. We study the Be star δ Cen circumstellar disk using long-baseline interferometry which is the only observing technique capable of resolving 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 to complete low (35) and medium (1500) spectral resolution observations. Results. We detected an oscillation in the visibility curve plotted as a function of the spatial frequency which is a clear signature of a companion around δ Cen. Our best-fit soltution infers 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 that contributes up 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 spherical symmetry is detected.
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Dates et versions

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

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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-00307590v2⟩
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