Optical spectroscopy of IRAS sources with infrared emission bands - IRAS 21282+5050 and the diffuse interstellar bands

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Infrared Astronomy Satellite, Infrared Sources (Astronomy), Optical Emission Spectroscopy, Planetary Nebulae, Stellar Spectrophotometry, Wolf-Rayet Stars, Computational Astrophysics, High Resolution, Hydrocarbons, Radial Velocity, Spectral Bands, Stellar Winds

Scientific paper

Spectroscopy of the starlike optical counterpart to IRAS 21282+5050, a source with the "hydrocarbon" infrared emission band spectrum, shows an O7(f)-[WC 11] planetary nebula nucleus suffering an extinction of 5.7 mag. Emission-line widths in the WC spectrum are only ≡100 km s-1, indicating a very slow stellar wind. Optical diffuse interstellar bands (DIBs) are prominent. Five DIBs are strongly enhanced, namely λλ5797, 6196, 6203,6283, and 6613. The presence of circumstellar hydrocarbon molecules may explain both the infrared emission bands and the enhanced DIBs.

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