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1.6–1.75 and 3.1–3.75 μM Spectrum of Hb5

Published online by Cambridge University Press:  07 August 2017

A. Magazzù  and
G. Strazzulla
A. Magazzù
Affiliation:
Osservatorio Astrofisico and Istituto di Astronomia, Citta' Universitaria, I-95125 Catania, Italy
G. Strazzulla
Affiliation:
Osservatorio Astrofisico and Istituto di Astronomia, Citta' Universitaria, I-95125 Catania, Italy

Extract

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We have recently obtained high resolution IR spectra (λ/δλ ≈ 1000) of the planetary nebula Hb 5, over the range 1.6–1.75 μm and 3.1–3.75 μm (Magazzù & Strazzulla 1992) at the European Southern Observatory (ESO). Emission bands have been detected the most prominent being at 3.3, usually attributed to PAH molecules, and 3.4 μm. For the predicted (de Muizon et al. 1986) first armonic (at 1.67 μm) of the 3.3 μm band we get an upper limit at least 45 times weaker than the 3.4 μm feature. This, together with the high ratio of fluxes F3.4/F3.3, challenges the hypothesis that the 3.4 μm band is the first hot band. We suggest that the first hot band may be identified with a small feature at 3.46 μm. In this case the first armonic would fall at 1.686 μm where we detect a small feature.

Type
III. Highlights on the Nebulae
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 226
Copyright
Copyright © Kluwer 1993 

References

Aitken, D.K., Roche, P.F., 1982, MNRAS 200, 217 Google Scholar
Aitken, D.K., Roche, P.F., 1984, MNRAS 208, 751 Google Scholar
de Muizon, M., Geballe, T.R., d'Hendecourt, L.B., Baas, F., 1986, ApJ 306, L105 Google Scholar
Magazzù, A., Strazzulla, G., 1992, A&A in press Google Scholar