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J/PAZh/26/510   Spectrum of bipolar nebula AFGL 2688   (Klochkova+, 2000)

Optical spectrum of the bipolar nebula AFGL 2688. Klochkova V.G., Szczerba R., Panchuk V.E. <Pis'ma Astron. Zh. 26, 510 (2000)> =2000PAZh...26..510K =2000AstL...26..439K
ADC_Keywords: Nebulae ; Spectrophotometry ; Equivalent widths ; Abundances Abstract: Based on echelle spectra obtained at the prime focus of the 6-m telescope, the detailed chemical composition of one of the components of the bipolar nebula identified with the intense infrared source AFGL 2688 was determined by the model-atmosphere method. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 21 02 18.8 +36 41 38 RAFGL 2688 = V1610 Cyg = Egg Nebula ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 41 197 Atomic data, equivalent widths of special lines and chemical composition table3.dat 56 26 Chemical composition log(eps(X)) of AFGL 2688 (for log(eps(H))= 12.0).
See also: J/PAZh/26/465 : IRAS 20004+2955 (V1027 Cyg) chemical comp. (Klochkova+, 2000) J/PAZh/26/115 : Spectrum of IRAS 23304+6147 (Klochkova+, 2000) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 F7.2 0.1nm Lambda Wavelength 10- 13 A4 --- El Element 16- 20 F5.2 eV ExcPot Excitation potential of the lower level 23- 27 F5.2 --- Loggf Oscillator strength (log gf) 30- 32 I3 0.1pm EW Equivalent width in milli(Angstroem) 33 A1 --- n_EW [*] Lines unused to determine the mean element abundance 36- 41 F6.2 --- A(X) Chemical composition (1)
Note (1): At hydrogen abundance A(H)=0, with model parameters Teff=6500K, logg=0.0 and ξ(t)=6.0km/s
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 A2 --- XSun Element 7- 10 F4.2 --- log(XSun) Sun elemental abundance (1) 19- 22 A4 --- X Ion 28- 31 F4.2 --- log(X) AFGL 2688 abundance for the ion 38- 41 F4.2 --- e_log(X) ? Error in the mean abundance derived for a given number of lines 45- 46 I2 --- Nline Number of lines used 52- 56 F5.2 Sun [X/Fe] Relative abundance (2)
Note (1): The elemental abundances in the solar photosphere were taken from Grevesse et al, 1996, ASP Conf. 99, 117; for lithium its meteoritic abundance was used Note (2): [X/Fe] = [log(X)-log(Fe)]* - [log(X)-log(Fe)]

(End) Veta Avedisova [INASAN] 02-May-2000
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

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