δ Centauri:: a new binary Be star detected by VLTI/AMBER spectro-interferometry

被引：18
|
作者：
Meilland, A. [1 ]
Millour, F. [1 ]
Stee, Ph. [2 ]
Spang, A. [2 ]
Petrov, R. [2 ]
Bonneau, D. [2 ]
Perraut, K. [3 ]
Massi, F. [4 ]
机构：
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] UNS OCA CNRS, UMR 6525, Lab AH FIZEAU, F-06108 Nice 2, France
[3] Univ Grenoble 1, Astrophys Lab, CNRS, UMR 5571, F-38041 Grenoble 9, France
[4] Ist Nazl Astrofis, INAF, Osservatorio Astrofis Arcetri, I-50125 Florence, Italy
来源：
ASTRONOMY & ASTROPHYSICS | 2008年 / 488卷 / 03期
关键词：
techniques : high angular resolution; techniques : interferometric; stars; emission-line; Be; stars : binaries : close; winds; outflows; stars : circumstellar matter;
D O I：
10.1051/0004-6361:200810624
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Aims. We study the Be star delta 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 delta 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 degrees, 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.
引用
收藏
页码：L67 / L70
页数：4
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