NGC-7027 - DISCOVERY OF A RAMAN LINE IN A PLANETARY-NEBULA

Authors
PEQUIGNOT D BALUTEAU JP MORISSET C BOISSON C
Citation
D. Pequignot et al., NGC-7027 - DISCOVERY OF A RAMAN LINE IN A PLANETARY-NEBULA, Astronomy and astrophysics, 323(1), 1997, pp. 217-222
Citations number
25
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
323
Issue
1
Year of publication
1997
Pages
217 - 222
Database
ISI
SICI code
0004-6361(1997)323:1<217:N-DOAR>2.0.ZU;2-V
Abstract
We report on the discovery of the He II Raman line lambda 485.1 nm in the spectrum of the planetary nebula NGC 7027. This line is direct evi dence for the presence of atomic hydrogen in the nebula. It is shown t hat this Raman line can provide reliable pieces of information concern ing both the velocity field of the He2+ region and the expansion veloc ity of the surrounding H-0 shell. Detection of self-Raman scattering o f Ly(gamma) is suspected.