2MASS J17134915-3706075 , the SIMBAD biblio

2014A&A...563A..42R - Astronomy and Astrophysics, volume 563A, 42-42 (2014/3-1)

Spectroscopic mapping of the planetary nebula NGC 6302.


Abstract (from CDS):

Most spectroscopic studies of planetary nebulae (PNe) are based on data from specific parts of the objects. Considering the high complexity of their morphological structures, integrated or average values across an observed region can only provide limited information of their ionic, density, and temperature structures. We investigate the spatial variation of the physical and chemical properties of NGC 6302, a high-ionization PNe, with a complex bipolar structure. Spatially resolved long-slit spectroscopic data were obtained from 11 parallel and equally spaced directions over the nebula. Maps of emission line fluxes, line ratios, electron temperature Te, electron density Ne, and ionic abundances (He+, He2+, N0, N+, O0, O+, O2+, S+, S2+, Ne2+, Ar2+, Ar3+, and Ar4+ relative to H+) were constructed with a spatial resolution of 1.45''x1'' for a large portion of the nebula over an area of 11''x250''. Electron densities were estimated from the [SII]λ6716/λ6731 and [ArIV]λ4711/λ4740 line ratios, and electron temperatures were estimated from the [OIII](λ4959+λ5007)/λ4363 and [NII](λ6548+λ6584)/λ5755 ratios. Integrated spectra were also obtained and 142 lines were identified. The electron density maps show a peaked distribution, with the densest area at the circumstellar region, reaching Ne≃40000cm–3, and decreasing to Ne≤1000cm–3 at the lobes. Knots were observed in the Ne (SII) map, with 2000cm–3<Ne<3000cm–3. The Ne (ArIV) map suggests the presence of an inner region with Ne≃20000cm–3 that extends from the center through the east lobe. A homogeneous temperature distribution was found for both Te(OIII) and Te(NII). Small temperature fluctuations on the plane of the sky of ts2(NII)=0.0071 and ts2(OIII)=0.0043 were estimated. In general, the total abundances obtained are similar to the maximum found in the ionic abundance maps of the dominant ionic species. This demonstrates the potential of spatially resolved abundance studies for establishing lower limits of the total abundances based on ionic abundances, for checking the ionization correlation factors, and in some cases, for determining the total abundances directly from maps of ionic abundances.

Abstract Copyright:

Journal keyword(s): planetary nebulae: individual: NGC 6302 - ISM: abundances

Simbad objects: 13

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