J/PAZh/30/946 Unidentified cometary emission lines (Simonia, 2004)
Unidentified cometary emission lines as the photoluminescence of
frozen hydrocarbon particles.
Simonia I.A.
<Pis'ma Astron. Zh. 30, 946 (2004)>
=2004PAZh...30..946S 2004PAZh...30..946S
=2004AstL...30..863S 2004AstL...30..863S
ADC_Keywords: Comets ; Spectroscopy
Abstract:
We discuss the possible nature of unidentified cometary emission
lines. We propose a model of the ice particles in cometary halos as a
mixture of frozen polycyclic aromatic hydrocarbons (PAHs) and acyclic
hydrocarbons. We describe the general properties of frozen hydrocarbon
particles (FHPs) and suggest interpreting some of the unidentified
cometary emission lines as the photoluminescence of FHPs. We compare
the position of quasi-lines in the spectrum of Comet 122P/de Vico with
the position of quasi-lines in the photoluminescence spectrum of PAHs
that were dissolved in acyclic hydrocarbons at a temperature of 77K
and that constituted a polycrystalline solution. We estimated the
detectability of FHP photoluminescence in cometary spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 63 317 Luminescence of cometary frozen hydrocarbon particles:
Results of our comparative analysis
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number of the PAH
4- 37 A34 --- PAH PAH name and formula
40- 48 A9 --- Solvent Solvent designation (1)
51- 54 I4 0.1nm LambdaPAH Spectral line wavelength of luminescent
emissions of polycrystalline solutions
57- 63 F7.2 0.1nm Lambda Spectral line wavelength of unidentified
cometary band
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Note (1): Solvent designations:
n-heptane, n-hexane, n-nonane, n-octane
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(End) Veta Avedisova [INASAN] 9-Mar-2005