Casassus, S; Roche, PF; Barlow, MJ; Binette, L; (2002) Optical-IR echelle spectroscopy of NGC 6302. In: Henney, WJ and Franco, J and Martos, M and Pena, M, (eds.) Revista Mexicana De Astronomía Y Astrofísica Serie De Conferencias. (pp. pp. 132-133). Instituto de Astronomía (Mexico)

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Abstract

Echelle spectroscopy of [Si VI] 1.96 µm, [Mg VIII] 3.03 µm, and [Ar VI] 4.53 µm, using UKIRT+CGS4, shows the line profiles in PN NGC 6302 are singly peaked and unresolved even at R ∼ 20 000, with line widths less than 22 km s−1. A photoionized structure is evidenced by spatial and velocity stratification as a function of ionization potential. But a variety of models, with density and Te gradients, reproduce the spectrum equally well. Preliminary analysis of the 3000–10000 ˚A echellogram of NGC 6302, acquired at R ∼ 80 000 using VLT+UVES, confirms the stratified nebular structure, but yields intriguing results concerning the line profiles: [Ne V] 3426 ˚A is broader than [Ne IV] 4723 ˚A. These observations rule out the existence of an evacuated cavity, or hot bubble, at least on 100 and 3 km s−1 scales. We do not confirm the broad wings in [Ne V] 3426 ˚A reported by Meaburn & Walsh (1980).

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