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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 (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:
FileName Lrecl Records Explanations
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).
Byte-by-byte Description of file: table
Bytes Format Units Label Explanations
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

(End) Patricia Bauer [CDS] 12-Aug-1996
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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