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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 54 Abundance ratios from optical observations
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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
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Bytes Format Units Label Explanations
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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)
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Note (1):
1 = Izotov & Thuan 1998ApJ...500..188I 1998ApJ...500..188I
2 = Izotov, Thuan, & Lipovetsky, 1997ApJS..108....1I 1997ApJS..108....1I
3 = Izotov, Thuan, & Lipovetsky, 1994ApJ...435..647I 1994ApJ...435..647I
4 = Thuan, Izotov, & Lipovetsky, 1995ApJ...445..108T 1995ApJ...445..108T
History:
From ApJ electronic edition
(End) Greg Schwarz [AAS] 29-Feb-2000