2007A&A...464...81D


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET04:51:01

2007A&A...464...81D - Astronomy and Astrophysics, volume 464, 81-86 (2007/3-2)

AMBER/VLTI and MIDI/VLTI spectro-interferometric observations of the B[e] supergiant CPD -57 2874.

DOMICIANO DE SOUZA A., DRIEBE T., CHESNEAU O., HOFMANN K.-H., KRAUS S., MIROSHNICHENKO A.S., OHNAKA K., PETROV R.G., PREISBISCH T., STEE P., WEIGELT G., LISI F., MALBET F. and RICHICHI A.

Abstract (from CDS):

We present the first high spatial and spectral resolution observations of the circumstellar envelope (CSE) of a B[e] supergiant (CPD-57°2874), performed with the Very Large Telescope Interferometer (VLTI). Spectra, visibilities and closure phase were obtained using the beam-combiner instruments AMBER (near-IR interferometry with three 8.3m Unit Telescopes or UTs) and MIDI (mid-IR interferometry with two UTs). The interferometric observations of the CSE are well fitted by an elliptical Gaussian model with FWHM diameters varying linearly with wavelength. Typical diameters measured are ≃1.8x3.4mas or ≃4.5x8.5AU (adopting a distance of 2.5kpc) at 2.2µm, and ≃12x15mas or ≃30x38AU at 12µm. The size of the region emitting the Brγ flux is ≃2.8x5.2mas or ≃7.0x13.0AU. The major-axis position angle of the elongated CSE in the mid-IR (≃144°) agrees well with previous polarimetric data, hinting that the hot-dust emission originates in a disk-like structure. In addition to the interferometric observations we also present new optical (UBVRcIc) and near-IR (JHKL) broadband photometric observations of CPD-57°2874. Our spectro-interferometric VLTI observations and data analysis support the non-spherical CSE paradigm for B[e] supergiants.

Abstract Copyright:

Journal keyword(s): techniques: high angular resolution - techniques: interferometric - infrared: stars - stars: early-type - stars: emission-line, Be - stars: mass-loss

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * phi02 Ori PM* 05 36 54.3881859 +09 17 26.409553 5.70 5.04 4.09 3.33 2.78 G9.5IIIbFe-2.5 336 0
2 * tet CMa PM* 06 54 11.3997692336 -12 02 19.061054441 7.20 5.51 4.08 2.95 2.17 K3/4III 207 0
3 CD-57 3107 Em* 10 15 21.9719703212 -57 51 42.737312199 12.27 11.72 10.15 9.78   M3 36 0
4 HD 90393 * 10 25 17.2142334016 -42 28 02.652154200   7.204 6.180     G8III 13 0
5 Ass Car OB 1 As* 10 38 -59.0           ~ 137 0
6 * u Car PM* 10 53 29.6552368 -58 51 11.416313 5.39 4.74 3.79 3.07 2.57 K0IV 86 0
7 * eps Cru PM* 12 21 21.6093625 -60 24 04.129070   5.01 3.59     K3III 81 0

    Equat.    Gal    SGal    Ecl

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2019.12.11-04:51:01

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