2007A&A...474L..49K


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.24CET02:37:54

2007A&A...474L..49K - Astronomy and Astrophysics, volume 474, L49-52 (2007/11-2)

The environment of the fast rotating star Achernar. High-resolution thermal infrared imaging with VISIR in BURST mode.

KERVELLA P. and DOMICIANO DE SOUZA A.

Abstract (from CDS):

It is expected that Be stars are surrounded by circumstellar envelopes, and that a significant fraction have companions. Achernar (α Eri) is the nearest Be star, and is thus a favourable target to search for their signatures using high resolution imaging. We aim at detecting circumstellar material or companions around Achernar at distances of a few tens of AU. We obtained diffraction-limited thermal IR images of Achernar using the BURST mode of the VLT/VISIR instrument. The images obtained in the PAH1 band show a point-like secondary source located 0.280" north-west of Achernar. Its emission is 1.8% of the flux of Achernar in this band, but is not detected in the PAH2, SiC and NeII bands. The flux from the detected secondary source is compatible with a late A spectral type main sequence companion to Achernar. The position angle of this source (almost aligned with the equatorial plane of Achernar) and its projected linear separation (12.3AU at the distance of Achernar) favor this interpretation.

Abstract Copyright:

Journal keyword(s): stars: individual: Achernar - methods: observational - techniques: high angular resolution - stars: emission-line, Be

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * del Phe PM* 01 31 15.1047497 -49 04 21.730837   4.918 3.935     G8.5IIIb 112 0
2 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 446 0
3 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4135 2
4 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 247 0
5 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 825 0

    Equat.    Gal    SGal    Ecl

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2020.11.24-02:37:54

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