J/MNRAS/361/1063 Oxygen abundances of HII regions (Perez-Montero+, 2005)
A comparative analysis of empirical calibrators for nebular metallicity.
Perez-Montero E., Diaz A.I.
<Mon. Not. R. Astron. Soc., 361, 1063-1076 (2005)>
=2005MNRAS.361.1063P 2005MNRAS.361.1063P
ADC_Keywords: H II regions ; Abundances
Keywords: ISM - abundances, HII regions
Abstract:
We present a new analysis of the main empirical calibrators of oxygen
abundance for ionised gas nebulae. With that aim we have compiled an
extensive sample of objects with emission line data including the near
IR [SIII] lines and the weak auroral lines which allow for the
determination of the gas electron temperature. For all the objects the
oxygen abundances have been derived in a homogeneous way, using the
most recent sets of atomic coefficients and taking into the account
the effect of particle density on the temperature of O+. The
residuals between directly and empirically-derived abundances as a
function of abundance have been studied. A grid of photo-ionisation
models, covering the range of physical properties of the gas, has been
used to explain the origin of the uncertainties affecting each
abundance calibrator. The range of validity for each abundance
parameter has been identified and its average uncertainty has been
quantified.
Description:
[SII] electron densities, [OII] and [OIII] electron temperatures and
oxygen chemical abundances for a sample of HII regions compiled in the
paper. Electron densities have been calculated from the
I(6717)/I(6731) quotient. When these lines have not been available, in
order to calculate te[OII] it has been supposed a value of
ne=100cm-3. te[OII] have been calculated from the I(3727)/I(7325)
quotient. When the auroral line has not been available, it has been
used photoionization models to deduce it from te(OIII) taking into
account the density value (see Perez-Montero & Diaz,
2003MNRAS.346..105P 2003MNRAS.346..105P).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
refs.dat 67 36 Bibliographic sources for flux data (table 1)
table2.dat 76 366 Density, temperatures and oxygen abundances
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See also:
J/A+AS/91/285 : HII galaxies spectrophotometric catalogue (Terlevich+, 1991)
Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Number of the reference in table 2
4- 16 A13 --- Object Object or type of object
19- 37 A19 --- BibCode BibCode for the flux data reference
39- 67 A29 --- Aut Author's name
68- 87 A20 --- Com Comments
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Name of the object or the region
16- 17 I2 --- r_Name Number of the reference for the flux data
19- 22 I4 cm-3 ne[SII] Electron density of [SII]
24- 26 I3 cm-3 e_ne[SII] ?=* Error of n[SII] (1)
28- 31 F4.2 10+4K te[OIII] Electron temperature of [OIII]
33- 36 F4.2 10+4K e_te[OIII] ?=* Error of t[OII] (1)
38- 41 F4.2 --- 12+log(O2+/H+) 12+log(O2+/H+) abundance
43- 46 F4.2 --- e_12+log(O2+/H+) ?=* Error of 12+log(O2+/H+) (1)
48- 51 F4.2 10+4K te[OII] ?=* [OII] Electron temperature (1)
53- 56 F4.2 10+4K e_te[OII] ?=* Error of t[OIII] (1)
58- 61 F4.2 --- 12+log(O2/H+) 12+log(O+/H+) abundance
63- 66 F4.2 --- e_12+log(O2/H+) ?=* Error of 12+log(O+/H+) (1)
68- 71 F4.2 --- 12+log(O/H) 12+log(O/H) abundance
73- 76 F4.2 --- e_12+log(O/H) ?=* Error of 12+log(O/H) (1)
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Note (1): All quantities marked as ***, are not really measured
because of the absence of the appropriate emission lines.
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Acknowledgements: Enrique Perez-Montero, enrique.perez(at)uam.es
(End) Patricia Vannier [CDS] 14-Aug-2005