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Temporal variations of FeII fluorescence lines in the symbiotic star AG peg

Eriksson, Mattias LU ; Johansson, Sveneric LU and Wahlgren, Glenn LU (2003) Euroconference on Symbiotic Stars Probing Stellar Evolution In Symbiotic Stars Probing Stellar Evolution, ASP Conference Proceedings 303. p.109-112
Abstract
An investigation of Fe II fluorescence by PAR (photoexcitation by accidental resonance) in AG Peg has been carried out using spectra recorded by the IUE satellite. Over 30 active pumping channels caused by PAR are observed and provide an explanation for 180 of the ultraviolet Fe II lines identified in the IUE spectra. The pumping lines are strong nebular lines originating from ionized elements, such as [Si III] lambda1892.03, N IV lambda1718.55, [O IV] lambda1401.16 in the wavelength region from 900 to 2000 Angstrom. In the first IUE spectra (1978) some of the pumping nebular lines had a broad foot at the base, but during the years 1980 to 1990 this declined and became too weak to be observed. During the same years the Fe II fluorescence... (More)
An investigation of Fe II fluorescence by PAR (photoexcitation by accidental resonance) in AG Peg has been carried out using spectra recorded by the IUE satellite. Over 30 active pumping channels caused by PAR are observed and provide an explanation for 180 of the ultraviolet Fe II lines identified in the IUE spectra. The pumping lines are strong nebular lines originating from ionized elements, such as [Si III] lambda1892.03, N IV lambda1718.55, [O IV] lambda1401.16 in the wavelength region from 900 to 2000 Angstrom. In the first IUE spectra (1978) some of the pumping nebular lines had a broad foot at the base, but during the years 1980 to 1990 this declined and became too weak to be observed. During the same years the Fe II fluorescence lines that corresponded to channels at wavelengths remarkably different from their pumping lines vanished since those channels could only be pumped by the broad foot. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Symbiotic Stars Probing Stellar Evolution, ASP Conference Proceedings
volume
303
pages
109 - 112
publisher
Astronomical Society of the Pacific
conference name
Euroconference on Symbiotic Stars Probing Stellar Evolution
external identifiers
  • WOS:000189467000016
ISBN
1-58381-152-4
language
English
LU publication?
yes
id
95370634-fb5f-430e-8569-96347e1fa8d9 (old id 1406563)
alternative location
http://adsabs.harvard.edu/abs/2003ASPC..303..109E
date added to LUP
2009-06-04 15:42:20
date last changed
2016-04-16 07:29:01
@misc{95370634-fb5f-430e-8569-96347e1fa8d9,
  abstract     = {An investigation of Fe II fluorescence by PAR (photoexcitation by accidental resonance) in AG Peg has been carried out using spectra recorded by the IUE satellite. Over 30 active pumping channels caused by PAR are observed and provide an explanation for 180 of the ultraviolet Fe II lines identified in the IUE spectra. The pumping lines are strong nebular lines originating from ionized elements, such as [Si III] lambda1892.03, N IV lambda1718.55, [O IV] lambda1401.16 in the wavelength region from 900 to 2000 Angstrom. In the first IUE spectra (1978) some of the pumping nebular lines had a broad foot at the base, but during the years 1980 to 1990 this declined and became too weak to be observed. During the same years the Fe II fluorescence lines that corresponded to channels at wavelengths remarkably different from their pumping lines vanished since those channels could only be pumped by the broad foot.},
  author       = {Eriksson, Mattias and Johansson, Sveneric and Wahlgren, Glenn},
  isbn         = {1-58381-152-4},
  language     = {eng},
  pages        = {109--112},
  publisher    = {ARRAY(0x9ea48a0)},
  series       = {Symbiotic Stars Probing Stellar Evolution, ASP Conference Proceedings},
  title        = {Temporal variations of FeII fluorescence lines in the symbiotic star AG peg},
  volume       = {303},
  year         = {2003},
}