Near-infrared spectroscopy and monochromatic isophotometry of NGC 6302

Phillips, J. P.; Reay, N. K. and White, G. J. (1983). Near-infrared spectroscopy and monochromatic isophotometry of NGC 6302. Monthly Notices of the Royal Astronomical Society, 203 pp. 977–985.

URL: http://adsabs.harvard.edu/full/1983MNRAS.203..977P

Abstract

A near-infrared spectrum on NGC6302 shows evidence for anomalously enhanced HeI 2'S-2'P, and the presence of H₂S(1)v=1→0 emission. The S(1) line is found to be confined to the inner regions of NGC6302, and we explore two processes whereby this might arise: shock interaction between a stellar wind and neutral inclusions, and formation of shocks behind ionization fronts. The strength of the Bγ line suggests the presence of relatively high central emission measures, and indicates densities of order N_e~10⁴ cm^-3 or higher. Contour maps in the lines [NII] λ6584 and [OIII] λ4959/5007 are also presented and these reveal the possible presence of low-excitation knots within the main nebular shell.

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