2008A&A...488L..67M


Query : 2008A&A...488L..67M

2008A&A...488L..67M - Astronomy and Astrophysics, volume 488, L67-70 (2008/9-4)

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

MEILLAND A., MILLOUR F., STEE P., SPANG A., PETROV R., BONNEAU D., PERRAUT K. and MASSI F.

Abstract (from CDS):

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. 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. 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 68.7mas, 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 1.6mas in K but no departure from spherical symmetry is detected.

Abstract Copyright:

Journal keyword(s): techniques: high angular resolution - techniques: interferometric - stars: emission-line, Be - stars: binaries: close - stars: winds, outflows - stars: circumstellar matter

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 457 0
2 HD 47536 PM* 06 37 47.6181076691 -32 20 23.040481884   6.43 5.258     K1III 99 1
3 * kap CMa Be* 06 49 50.4593263 -32 30 30.522482 2.73 3.68 3.89 3.91 4.05 B1.5Ve 277 0
4 * ome CMa Be* 07 14 48.6538664 -26 46 21.609714 2.90 3.64 3.82 3.80 3.90 B2.5Ve 341 0
5 HD 90798 V* 10 28 02.0952416304 -49 24 20.888342172   7.583 6.086     K4III 16 0
6 HD 105383 * 12 08 04.8662182320 -50 45 49.129250868   6.305 6.362     B9V 37 0
7 HD 105382 Be* 12 08 05.2222663992 -50 39 40.575451536 3.65 4.32 4.47 4.53 4.70 B5V 160 0
8 * del Cen Be* 12 08 21.4976373 -50 43 20.738614 1.51 2.39 2.52 2.48 2.62 B2Vne 301 0
9 HD 109538 * 12 35 47.1056210136 -45 03 35.940912228   9.59 8.33     K1III 5 0
10 HD 109593 * 12 36 12.2639446800 -52 25 03.791124660   8.18 6.54     K5/M0III 14 0
11 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 250 0

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2022.08.16-20:42:51

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