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J/ApJ/511/639     Abundances in blue compact galaxies       (Izotov+, 1999)

Heavy-element abundances in blue compact galaxies Izotov Y.I., Thuan T.X. <Astrophys. J. 511, 639 (1999)> =1999ApJ...511..639I
ADC_Keywords: Abundances; Galaxies, optical; H II regions Keywords: galaxies: abundances - galaxies: compact - galaxies: ISM Abstract: We present high-quality ground-based spectroscopic observations of 54 supergiant H II regions in 50 low-metallicity blue compact galaxies with oxygen abundances 12+Log[O/H] between 7.1 and 8.3. We use the data to determine abundances for the elements N, O, Ne, S, Ar, and Fe. We also analyze Hubble Space Telescope (HST) Faint Object Spectrograph archival spectra of 10 supergiant H II regions to derive C and Si abundances in a subsample of seven blue compact galaxies. The main result of the present study is that none of the heavy element-to-oxygen abundance ratios studied here (C/O, N/O, Ne/O, Si/O, S/O, Ar/O, Fe/O) depend on oxygen abundance for blue compact galaxies with 12+Log[O/H]≤7.6 (Z≤Z_{solar}/20). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 106 54 Abundance ratios from optical observations
See also: J/AJ/116/2805 : H II regions in spiral galaxies (Van Zee+, 1998) J/A+AS/139/1 : HI in Byurakan blue comact galaxies (Thuan+, 1999) J/A+AS/147/169 : Accurate positions of 2978 SBS objects (Bicay+, 2000) J/A+A/373/24 : Blue compact galaxies from SBS (Pustilnik+ 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name 14- 18 F5.2 [] O/H ? Log oxygen abundance relative to hydrogen (12+log[O/H]) 21- 24 F4.2 [] e_O/H ? Uncertainty in O/H 27- 31 F5.2 [] N/O ? Log nitrogen nitrogen abundance relative to oxygen 34- 37 F4.2 [] e_N/O ? Uncertainty in N/O 40- 44 F5.2 [] Ne/O ? Log neon abundance relative to oxygen 47- 50 F4.2 [] e_Ne/O ? Uncertainty in Ne/O 53- 57 F5.2 [] S/O ? Log sulfur abundance relative to oxygen 60- 63 F4.2 [] e_S/O ? Uncertainty in S/O 66- 70 F5.2 [] Ar/O ? Log argon abundance relative to oxygen 73- 76 F4.2 [] e_Ar/O ? Uncertainty in Ar/O 79- 83 F5.2 [] O/Fe ? Log oxygen abundance relative to iron 86- 89 F4.2 [] e_O/Fe ? Uncertainty in O/Fe 92-101 A10 --- OName ? Other object name 106 I1 --- Ref Reference (1)
Note (1): 1 = Izotov & Thuan 1998ApJ...500..188I 2 = Izotov, Thuan, & Lipovetsky, 1997ApJS..108....1I 3 = Izotov, Thuan, & Lipovetsky, 1994ApJ...435..647I 4 = Thuan, Izotov, & Lipovetsky, 1995ApJ...445..108T
History: From ApJ electronic edition
(End) Greg Schwarz [AAS] 29-Feb-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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