Shock excitation in the planetary nebula NGC 6302 changes line ratios so that standard nitrogen abundance corrections overestimate N, with a new kinematic distance of 805 +/- 143 pc.
@doi [ ] 10.1086/172881, http://adsabs.harvard.edu/abs/1993ApJ...411..778B 411
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The case of NGC 6302: The impact of shocks in the derivation of Nitrogen abundances
Shock excitation in the planetary nebula NGC 6302 changes line ratios so that standard nitrogen abundance corrections overestimate N, with a new kinematic distance of 805 +/- 143 pc.