Observational study identifies carbon bearing molecules in protoplanetary nebulae, suggesting new insights into stellar atmospheres.
We present an analysis of high resolution spectra in the optical and near infrared wavelength region for cool protoplanetary nebulae with the goal to identify lines of carbon bearing molecules and some less studied neutron capture elements. The site of formation of CN and C 2 lines in the spectra of IRAS 22272+5435 and IRAS Z02229+6208 appears to be an extended stellar atmosphere and inner/outer CSE. The abundance of thulium was estimated for the first time in the photosphere of IRAS22272+5435, log ε ( Tm ) ≃ 1.5.
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Grankina et al. (2023) studied this question.
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