Access to Astronomical Catalogues

← Click to display the menu
J/A+A/442/249       Integrated spectrum of NGC 7027          (Zhang+, 2005)

Integrated spectrum of the planetary nebula NGC 7027. Zhang Y., Liu X.-W., Luo S.-G., Pequignot D., Barlow M.J. <Astron. Astrophys. 442, 249 (2005)> =2005A&A...442..249Z
ADC_Keywords: Planetary nebulae ; Spectroscopy Keywords: line: identification - ISM: abundances - ISM: planetary nebulae: individual: NGC 7027 Abstract: We present deep optical spectra of the archetypal young planetary nebula (PN) NGC 7027, covering a wavelength range from 3310 to 9160Å. The observations were carried out by uniformly scanning a long slit across the entire nebular surface, thus yielding average optical spectra for the whole nebula. A total of 937 emission features are detected. The extensive line list presented here should prove valuable for future spectroscopic analyses of emission line nebulae. The optical data, together with the archival IUE and ISO spectra, are used to probe the temperature and density structures and to determine the elemental abundances from lines produced by different excitation mechanisms. Description: Optical and UV emission-line measurements and identifications of NGC 7027. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 21 07 01.6 +42 14 10 NGC 7027 = PN G084.9-03.4 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 90 1192 Optical line fluxes on a scale where Hβ=100 table2.tex 114 1216 LaTeX version of table2 table4.dat 30 30 UV line fluxes table4.tex 76 43 LaTeX version of table4
See also: J/A+A/303/175 : Line spectrum of NGC 7027 (Baluteau+, 1995) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 F7.2 0.1nm lambdaObs Observed wavelength 9- 17 F9.4 --- Flux ? Flux, F(λ) (F(Hβ)=100) 18 A1 --- u_Flux Uncertainty flag on Flux 19 A1 --- n_Flux [s] s: Saturated even if in short exposures 20- 28 F9.4 --- Int ? Intensity, I(λ) (I(Hβ)=100) 29 A1 --- n_lambdaObs [*] *: blended 31- 39 A9 --- Ion Ion 41- 47 F7.2 0.1nm lambdaLab ? Laboratory wavelength 49- 55 A7 --- Mult Multiplet number 59- 68 A10 --- LTerm Lower energy term 71- 80 A10 --- UTerm Upper energy term 82- 83 I2 --- g1 ? Statistial weight of lower energy level (1) 89- 90 I2 --- g2 ? Statistial weight of upper energy level (1)
Note (1): For a feature blended with a few lines from the same multiplet, this is a sum of statistical weights.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 0.1nm lambda Wavelength 6- 17 A12 --- Ion Ion 19- 23 F5.2 10-15W/m2 Flux Flux, F(λ) 25- 30 F6.2 --- Int Intensity, I(λ) (I(Hβ)=100)
Acknowledgements: Y. Zhang, Zhangy(at)
(End) Patricia Vannier [CDS] 12-Jul-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service