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Determination of hyperfine-induced transition rates from observations of a planetary nebula

Brage, Tomas LU ; Judge, PG and Proffitt, CR (2002) In Physical Review Letters 89(28).
Abstract
Observations of the planetary nebula NGC3918 made with the STIS instrument on the Hubble Space Telescope reveal the first unambiguous detection of a hyperfine-induced transition 2s2p P-3(0)o-->2s(2) S-1(0) in the berylliumlike emission line spectrum of N IV at 1487.89 Angstrom. A nebular model allows us to confirm a transition rate of 4x10(-4) sec(-1)+/-33% for this line. The measurement represents the first independent confirmation of the transition rate of hyperfine-induced lines in low ionization stages, and it provides support for the techniques used to compute these transitions for the determination of very low densities and isotope ratios.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
89
issue
28
publisher
American Physical Society
external identifiers
  • wos:000180317900004
  • scopus:0037207403
ISSN
1079-7114
DOI
10.1103/PhysRevLett.89.281101
language
English
LU publication?
yes
id
5ac67b43-5a37-4f6a-b0d3-e12917a2a913 (old id 319713)
date added to LUP
2007-08-10 15:30:17
date last changed
2017-11-12 03:21:16
@article{5ac67b43-5a37-4f6a-b0d3-e12917a2a913,
  abstract     = {Observations of the planetary nebula NGC3918 made with the STIS instrument on the Hubble Space Telescope reveal the first unambiguous detection of a hyperfine-induced transition 2s2p P-3(0)o-->2s(2) S-1(0) in the berylliumlike emission line spectrum of N IV at 1487.89 Angstrom. A nebular model allows us to confirm a transition rate of 4x10(-4) sec(-1)+/-33% for this line. The measurement represents the first independent confirmation of the transition rate of hyperfine-induced lines in low ionization stages, and it provides support for the techniques used to compute these transitions for the determination of very low densities and isotope ratios.},
  author       = {Brage, Tomas and Judge, PG and Proffitt, CR},
  issn         = {1079-7114},
  language     = {eng},
  number       = {28},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Determination of hyperfine-induced transition rates from observations of a planetary nebula},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.89.281101},
  volume       = {89},
  year         = {2002},
}