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Study of He II Raman Scattering Profiles in NGC 7027

Published online by Cambridge University Press:  26 May 2016

D. Péquignot ,
J. R. Walsh  and
C. Morisset
D. Péquignot
Affiliation:
Observatoire de Paris - Meudon, F-92195 Meudon Principal Cedex, France
J. R. Walsh
Affiliation:
Space Telescope European Co-ordinating Facility, European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748 Garching, Germany
C. Morisset
Affiliation:
Institut d'Astrophysique de Marseille, Traverse du Siphon, BP 8, F-13376 Marseille Cedex 12, France

Extract

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Péquignot et al. (1997) reported the discovery of a broad spectral feature to the blueward of Hβ, centred at a wavelength of 4852Å, in NGC 7027. This was conclusively shown to arise from the Raman scattering of He++ (2–8) UV photons by neutral H, and was the first detection in a planetary nebula. Raman scattering features had previously been observed in symbiotic stars: Raman scattering of O VI by neutral H was discovered by Schmid (1992) and also found for He II by van Groningen (1993). The large width of the resulting feature is mainly due to the conservation of the line width in frequency during the scattering process.

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. 403 - 404
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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