2006A&A...455.1009C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST16:27:59

2006A&A...455.1009C - Astronomy and Astrophysics, volume 455, 1009-1018 (2006/9-1)

A close look into the carbon disk at the core of the planetary nebula CPD-56°8032.

CHESNEAU O., COLLIOUD A., DE MARCO O., WOLF S., LAGADEC E., ZIJLSTRA A.A., ROTHKOPF A., ACKER A., CLAYTON G.C. and LOPEZ B.

Abstract (from CDS):

We present high spatial resolution observations of the dusty core of the Planetary Nebula with Wolf-Rayet central star CPD-56°8032, for which indications of a compact disk have been found by HST/SITS observations. These observations were taken with the mid-infrared interferometer VLTI/MIDI in imaging mode providing a typical 300mas resolution and in interferometric mode using UT2-UT3 47m baseline providing a typical spatial resolution of 20mas. We also made use of unpublished HST/ACS images in the F435W and F606W filters. The visible HST images exhibit a complex multilobal geometry dominated by faint lobes. The farthest structures are located at 7'' from the star. The mid-IR environment of CPD-56°8032 is dominated by a compact source, barely resolved by a single UT telescope in a 8.7µm filter (Δλ=1.6µm, contaminated by PAH emission). The infrared core is almost fully resolved with the three 40-45m projected baselines ranging from -5° to 51° but smooth oscillating fringes at low level have been detected in spectrally dispersed visibilities. This clear signal is interpreted in terms of a ring structure which would define the bright inner rim of the equatorial disk. Geometric models allowed us to derive the main geometrical parameters of the disk. For instance, a reasonably good fit is reached with an achromatic and elliptical truncated Gaussian with a radius of 97±11AU, an inclination of 28±7° and a PA for the major axis at 345°±7°. Furthermore, we performed some radiative transfer modeling aimed at further constraining the geometry and mass content of the disk, by taking into account the MIDI dispersed visibilities, spectra, and the large aperture SED of the source. These models show that the disk is mostly optically thin in the N band and highly flared. As a consequence of the complex flux distribution, an edge-on inclination is not excluded by the data.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - techniques: high angular resolution - stars: AGB and post-AGB - stars: circumstellar matter - stars: mass-loss

Simbad objects: 6

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Number of rows : 6

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 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 725 0
2 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 230 0
3 IRAS 16279-4757 pA* 16 31 38.7378047645 -48 04 05.640499647           M3II 39 0
4 * zet Ara * 16 58 37.2121689 -55 59 24.520302   4.701 3.076     K3III 90 0
5 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 251 0
6 * ksi Dra PM* 17 53 31.7296234 +56 52 21.514262 6.14 4.93 3.75 2.92 2.33 K2III 258 0

    Equat.    Gal    SGal    Ecl

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2021.04.21-16:27:59

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