Infrared high spatial resolution study of the Planetary Nebula Hen 2-113

Details Infrared high spatial resolution study of the Planetary Nebula Hen 2-113 Infrared high spatial resolution study of the Planetary Nebula Hen 2-113

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..341l&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report infrared observations of the planetary nebula Hen 2-113 obtained with VLT/NACO, VLTI/MIDI, VLT/ISAAC and TIMMI at the ESO 3.6m. Hen 2-113 exhibits a clear ring-like structure superimposed to a more diffuse environment visible in the L' (3.8μm), M' (4.78μm) and 8.7μm bands. No clear core at 8.7μm and no fringes through the N band could be detected for this object with MIDI. A qualitative interpretation of the object structure is proposed using a diabolo-like geometrical model. Our ISAAC and TIMMI observations indicates that the PAHs are mostly concentrated towards the lobes of the diabolo and the bipolar lobes of the nebula. In L' band, a void 0.3" in diameter was discovered with NACO around the central source, which appears resolved with measured FWHM about 155 mas. Our measurements indicate that the observed fluxes from this source in L' and M' are about 300 and 800 times respectively smaller than those expected from a model including only the central star. This infrared excess can be explained by emission from a cocoon of hot dust (T˜1000K) with a total mass ˜10-9M&sun;.

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