J/MNRAS/415/181 Deep spectroscopy of NGC 7009 (Fang+, 2011)
Very deep spectroscopy of the bright Saturn nebula NGC 7009.
I. Observations and plasma diagnostics.
Fang X., Liu X.-W.
<Mon. Not. R. Astron. Soc., 415, 181-198 (2011)>
=2011MNRAS.415..181F 2011MNRAS.415..181F
ADC_Keywords: Planetary nebulae ; Spectroscopy
Keywords: atomic data - atomic processes - line: identification -
planetary nebulae: individual: NGC 7009
Abstract:
We present very deep CCD spectrum of the bright, medium-excitation
planetary nebula NGC 7009, with a wavelength coverage from 3040 to
11000Å. Traditional emission line identification is carried out to
identify all the emission features in the spectra, based on the
available laboratory atomic transition data. Since the spectra are of
medium resolution, we use multi-Gaussian line profile fitting to
deblend faint blended lines, most of which are optical recombination
lines (ORLs) emitted by singly ionized ions of abundant second-row
elements such as C, N, O and Ne.
Description:
The spectra analysed in the current work were observed from 1995 July
to 2001 June, using the ESO 1.52-m and the WHT 4.2-m telescopes.
Objects:
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RA (2000) DE Designation(s)
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21 04 10.83 -11 21 48.2 NGC 7009 = HD 200516
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 91 1675 Emission line list of NGC 7009
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See also:
J/MNRAS/409/881 : Spectrosocpy of NGC 7009 (Phillips+, 2010)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 0.1nm lam.O ?=- Observed wavelength
10- 18 F9.4 --- Flux ? Line flux, normalized to Hβ=100
20- 28 F9.4 --- Int ? Intensity, normalized to Hβ=100
30 A1 --- Note [*] Note for blending lines (1)
32- 40 A9 --- Ion Ion designation (2)
41- 48 F8.2 0.1nm lam.L ?=- Laboratory wavelength
50- 56 A7 --- Mult Multiplet number
58- 67 A10 --- LowT Lower term
69- 78 A10 --- UppT Upper term
80- 81 I2 --- g1 [1/72]? g1 number
83- 84 I2 --- g2 [1/98]? g2 number
85 A1 --- n_g2 [*] * when no g2 number
86- 90 F5.2 % e_Flux ? Flux error
91 A1 --- u_Flux Uncertainty flag of Flux error
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Note (1): The asterisk " * " in front of an identification denotes the line
is blended with an adjacent feature, or it is an alternate identification
by EMILI.
Note (2): The question mark denotes this transition is unknown.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Feb-2012