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Lines of O IV and S IV in the Goddard High-Resolution Spectrograph spectrum of RR Tel: constraints on atomic data

Harper, GM; Jordan, C; Judge, PG; Robinson, RD; Carpenter, KG and Brage, Tomas LU (1999) In Monthly Notices of the Royal Astronomical Society 303(3). p.41-46
Abstract
High signal-to-noise ratio spectra of RR Tel obtained at medium resolution with the Goddard High-Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) are used to test available atomic data for the O IV 2s(2)2p P-2-2s2p(2) P-4 multiplet (UV 0.01). The fine-structure intervals of the 2s2p(2) P-4 term given by Moore (1983) appear to need revision. The flux ratios of lines within multiplet UV (0.01), which have a common upper level, depend only on transition probabilities. The observed flux ratio of lines from the P-4(3/2) level differs from that predicted by theory, but this difference cannot be attributed to a blend with a line of S IV]. At the electron densities in the RR Tel nebula, other flux ratios give information on the... (More)
High signal-to-noise ratio spectra of RR Tel obtained at medium resolution with the Goddard High-Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) are used to test available atomic data for the O IV 2s(2)2p P-2-2s2p(2) P-4 multiplet (UV 0.01). The fine-structure intervals of the 2s2p(2) P-4 term given by Moore (1983) appear to need revision. The flux ratios of lines within multiplet UV (0.01), which have a common upper level, depend only on transition probabilities. The observed flux ratio of lines from the P-4(3/2) level differs from that predicted by theory, but this difference cannot be attributed to a blend with a line of S IV]. At the electron densities in the RR Tel nebula, other flux ratios give information on the relative electron excitation rates between the P-2 and P-4 fine-structure levels. Using the collision strengths calculated by Zhang, Graziani & Pradhan, the rate to the P-4(5/2) level, relative to the rates to the other J states, appears to be underestimated by similar to 10 per cent, which is within the expected uncertainty of 20 per cent. We also discuss the S IV 3s(2)3p P-2-3s3p(2) P-4 multiplet. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
RR Tel, individual, ultraviolet, stars, atomic data, symbiotic, binaries
in
Monthly Notices of the Royal Astronomical Society
volume
303
issue
3
pages
41 - 46
publisher
Wiley-Blackwell
external identifiers
  • wos:000079153600002
  • scopus:0002477318
ISSN
1365-2966
DOI
10.1046/j.1365-8711.1999.02392.x
language
English
LU publication?
yes
id
d933c93c-4dd8-4143-89ef-4213e2eab753 (old id 3919497)
date added to LUP
2013-07-09 08:08:42
date last changed
2017-07-09 03:41:46
@article{d933c93c-4dd8-4143-89ef-4213e2eab753,
  abstract     = {High signal-to-noise ratio spectra of RR Tel obtained at medium resolution with the Goddard High-Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) are used to test available atomic data for the O IV 2s(2)2p P-2-2s2p(2) P-4 multiplet (UV 0.01). The fine-structure intervals of the 2s2p(2) P-4 term given by Moore (1983) appear to need revision. The flux ratios of lines within multiplet UV (0.01), which have a common upper level, depend only on transition probabilities. The observed flux ratio of lines from the P-4(3/2) level differs from that predicted by theory, but this difference cannot be attributed to a blend with a line of S IV]. At the electron densities in the RR Tel nebula, other flux ratios give information on the relative electron excitation rates between the P-2 and P-4 fine-structure levels. Using the collision strengths calculated by Zhang, Graziani & Pradhan, the rate to the P-4(5/2) level, relative to the rates to the other J states, appears to be underestimated by similar to 10 per cent, which is within the expected uncertainty of 20 per cent. We also discuss the S IV 3s(2)3p P-2-3s3p(2) P-4 multiplet.},
  author       = {Harper, GM and Jordan, C and Judge, PG and Robinson, RD and Carpenter, KG and Brage, Tomas},
  issn         = {1365-2966},
  keyword      = {RR Tel,individual,ultraviolet,stars,atomic data,symbiotic,binaries},
  language     = {eng},
  number       = {3},
  pages        = {41--46},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Lines of O IV and S IV in the Goddard High-Resolution Spectrograph spectrum of RR Tel: constraints on atomic data},
  url          = {http://dx.doi.org/10.1046/j.1365-8711.1999.02392.x},
  volume       = {303},
  year         = {1999},
}