Back to Volume
Paper: High Spatial Resolution Study of the inner Environment around Two Young Planetary Nebulae
Volume: 355, Stars With the B[e] Phenomenon
Page: 117
Authors: Chesneau, O.
Abstract: We present observations of the dusty emission from the young planetary nebulae Hen 2–113 and CPD–56°8032 obtained with VLT/NACO, VLTI/ MIDI. The central stars of these two objects are Wolf-Rayet stars of the same spectral type [WC10]. They share an impressive number of characteristics and are located at similar distance, making the detection of any differences in their close environment of great interest. Hen 2–113 exhibits a clear ringlike structure of about 0.4 arcsec in diameter, superimposed to a more diffuse environment visible in L′, M′ and 8.7μm bands. No clear core could be detected for this object with MIDI through the N band. The dusty environment of CPD–56°8032 is much more compact, dominated by a bright, barely resolved, core whereas the visible nebula exhibits an amazing complexity. From MIDI 8.7μm acquisition images (dominated by PAHs emission), the extension and geometry of the core have been estimated and compared to the STIS/HST observations (De Marco et al. 1997, 2002). Moreover, high SNR fringes at low level have been detected with projected baselines between 40 and 45 meters. This clear signal is interpreted in terms of the bright inner rim of a dusty disk exposed to the flux from the Wolf-Rayet star. The geometrical parameters of the N band flux distribution are well constrained by means of simple geometrical models and a simple radiative transfer model has been developed to extract the physical parameters of the disk.
Back to Volume