J/A+A/321/29 Star cluster evolution (Olofsson 1997)
Effects of star cluster evolution on emission line ratios and
the application to H II galaxies. Including a calibration of
the R23 vs. 12+log(O/H) relationship
Olofsson K.
<Astron. Astrophys. 321, 29 (1997)>
=1997A&A...321...29O 1997A&A...321...29O (SIMBAD/NED BibCode)
ADC_Keywords: Models, evolutionary
Keywords: galaxies: evolution - galaxies: stellar content - galaxies: starburst
Abstract:
A model of spectral evolution of star forming galaxies of various
metallicity has been used to study the relation between the optical
emission line ratio
R23=([OII]λ3727+[OIII]λλ4959,5007)/Hβ and
the nebular oxygen abundance. It is shown that the scatter in an
empirical comparison sample could be due to various upper stellar mass
limits or different slopes of the stellar initial mass function in
these objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.ps 72 7703 Empirical logR23 oxygen abundance relation.
fig2.ps 80 491 Evolutionary effects on the [OIII]5077/Hbeta
emission line ratio.
fig3.ps 80 327 Evolution of the emission line ratio
[OIII]3727/Hbeta.
fig4.ps 80 336 Effect of temporal evolution on the total
number of Lyman continuum photons emitted from
stellar populations of various metallicity
fig5.ps 80 503 R23 versus oxygen abundance relation.
fig6.ps 80 433 Effects of a non-instantaneous burst of star
formation on the R23 versus oxygen abundance
relation.
fig7.ps 80 674 R23 versus oxygen abundance under different
assumptions about the slope of the IMF and the
upper mass limit.
fig8.ps 80 672 Theoretical temporal evolution of R23 using
an instantaneous burst of star formation.
fig9.ps 80 493 Effects of a non-instantaneous burst of star
formation on the R23 versus oxygen abundance
relation.
fig10.ps 80 503 R23 versus oxygen abundance calculated in the
interval log(Q(H))=49.0-53.0.
fig11.ps 80 500 R33 versus oxygen abundance calculated in the
interval log(Q(H))=49.0-53.0.
fig12.ps 80 642 Objects of Masegosa et al. (1994) as well as
Davidson and Kinman (1985) plotted in
intervals of Tion in the R23 versus oxygen
abundance plane.
fig13.ps 80 370 Calibrated R23 versus oxygen abundance
relation.
table 31 385 Data of figs. 10 and 11 (extended).
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Byte-by-byte Description of file: table
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Bytes Format Units Label Explanations
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1- 2 I2 --- logQ(H) Number of Lyman continuum photon
4- 5 I2 --- No Running number
7- 10 F4.2 --- 12+log(O/H) Oxygen abundance
12- 18 F7.4 --- R23 R23 ([OII]3727+[OIII]4959,5007)/Hbeta) value
20- 25 F6.4 --- R33 R33 ([OIII]4363+[OIII]4959,5007)) value
27- 31 I5 K T Temperature of ionizing radiation
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(End) Patricia Bauer [CDS] 12-Aug-1996