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A Deep UV-Blue Planetary Nebula Template Spectrum from NGC 7027

Published online by Cambridge University Press:  26 May 2016

J. R. Walsh ,
D. Péquignot ,
C. Morisset ,
P. J. Storey ,
B. Sharpee ,
J. Baldwin ,
P. A. M. van Hoof  and
R. E. Williams
J. R. Walsh
Affiliation:
ST-ECF, ESO, Karl-Schwarzschild Strasse 2, D-85748 Garching, Germany
D. Péquignot
Affiliation:
Observatoire de Paris - Meudon, F-92195 Meudon Cedex, France
C. Morisset
Affiliation:
Institut d'Astrophysique de Marseille, Traverse du Siphon, BP 8, F-13376 Marseille Cedex 12, France
P. J. Storey
Affiliation:
Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK
B. Sharpee
Affiliation:
Department of Physics & Astronomy, Michigan State University, East Lansing, MI 48824-1116, USA
J. Baldwin
Affiliation:
Department of Physics & Astronomy, Michigan State University, East Lansing, MI 48824-1116, USA
P. A. M. van Hoof
Affiliation:
Canadian Institute for Theoretical Astrophysics & Department of Astronomy, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada
R. E. Williams
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Extract

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NGC 7027 is justifiably THE template spectrum for PNe. Its vast range of emission species – from molecular and neutral to ions with ionization potential > 120eV – its high surface brightness and accessibiliy for northern observatories make it the PN laboratory of choice. However the quality of the spectra from the UV to the IR is mixed, many line fluxes and identifications still remaining unchecked from photographic or image tube spectra. Very deep spectra of NGC 7027 (emission line strengths <10-4 of Hβ) in the 0.65 to 1.05μm region (Baluteau et al. 1995) showed the presence of many faint emission lines. Pequignot & Baluteau (1994) showed that heavy elements from the 4th, 5th and 6th rows of the Periodic Table have much higher abundances than Solar, confirming the synthesis of neutron capture elements in low mass stars and providing new constraints on stellar evolution theory.

Type
Part VI: The Ionized Gas in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 337 - 338
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Baluteau, J.-P., Zavagno, A., Morisset, C., Péquignot, D., 1995, A&A, 303, 175 Google Scholar
Davey, A. R., Storey, P. J., Kisielius, R., 2000, A&AS, 142, 85 Google Scholar
Péquignot, D., 1996, Physica Scripta, T65, 137 Google Scholar
Péquignot, D., & Baluteau, J.-P., 1994, A&A, 283, 593 Google Scholar