Hostname: page-component-745bb68f8f-d8cs5 Total loading time: 0 Render date: 2025-01-13T00:37:36.256Z Has data issue: false hasContentIssue false
  • English
  • Français

Metallicity Effects in Massive Star Evolution and Number Frequencies of WR Stars in Galaxies

Published online by Cambridge University Press:  03 August 2017

André Maeder
André Maeder*
Affiliation:
Geneva Observatory CH-1290 Sauverny, Switzerland

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The results of new grids of models of massive stars with metallicities Z = 0.002, 0.005, 0.020 and 0.040 and mass loss rates depending on Z are shown. When integrated over the mass spectrum, the models enable us to predict number ratios, such as WR/O, WC/WN, WNE/WR, WNL/WR, WCE/WR, WCL/WR, WO/WR as a function of Z in galaxies.

Comparisons between models and observations in galaxies are made and show, as was suggested by Maeder, Lequeux and Azzopardi (1980), that the effects of metallicity on the mass loss rates are the prime agent responsible for the different distributions of massive stars in galaxies.

Type
Session VII. Evolution
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 445 - 452
Copyright
Copyright © Kluwer 1991 

References

Abbott, D., Bieging, J.H., Churchwell, E., Torres, A.V.: 1986, Astrophys. J. 303, 239 CrossRefGoogle Scholar
Armandroff, T.E., Massey, P.: 1985, Astrophys. J. 291, 685 CrossRefGoogle Scholar
Arnault, P., Kunth, D., Schild, H.: 1989, Astron. Astrophys. 224, 73 Google Scholar
Azzopardi, M., Breysacher, J.: 1985, Astron. Astrophys. 149, 213 Google Scholar
Bertelli, G., Chiosi, C.: 1981, in The most massive stars, Ed. D'Odorico, S. et al., ESO, Garching, p. 211 Google Scholar
Breysacher, J.: 1981, Astron. Astrophys. Suppl. Ser. 43, 203 Google Scholar
Conti, P.S., Garmany, C.D., de Loore, C., Vanbeveren, D.: 1983a, Astrophys. J. 274, 302 CrossRefGoogle Scholar
Conti, P.S., Vacca, B., 1990: Astrophys. J. in press Google Scholar
van der Hucht, K.A., Hidayat, B., Admiranto, A.G., Supelli, K.R., Doom, C.: 1988, Astron. Astrophys. 199, 217 Google Scholar
de Jager, C., Nieuwenhuijzen, H., van der Hucht, K.A.: 1988, Astron. Astrophys. Suppl. Ser. 72, 259 Google Scholar
Kudritzki, R.P., Pauldrach, A., Puls, J.: 1987, Astron. Astrophys. 173, 293 Google Scholar
Langer, N.: 1989, Astron. Astrophys. 220, 135 Google Scholar
Maeder, A.: 1990a, Astron. Astrophys. Suppl. Ser. 84, 139 Google Scholar
Maeder, A.: 1990b, Astron. Astrophys. in press Google Scholar
Maeder, A., Lequeux, J., Azzopardi, M.: 1980, Astron. Astrophys. 90, L17 (MLA) Google Scholar
Maeder, A., Meynet, G.: 1989, Astron. Astrophys. 210, 155 Google Scholar
Meylan, G., Maeder, A.: 1983, Astron. Astrophys. 124, 84 Google Scholar
Schmutz, W., Hamann, W.-R., Wessolowski, K.: 1989, Astron. Astrophys. 210, 236 Google Scholar
Smith, L.F.: 1968, M.N.R.A.S. 141, 317 CrossRefGoogle Scholar
Smith, L.F.: 1973, IAU Symp. 49, 15 Google Scholar
Smith, L.F.: 1982, IAU Symp. 99, 597 Google Scholar
Smith, L.F.: 1988, Astrophys. J. 327, 128 CrossRefGoogle Scholar
Smith, L.F., Hummer, D.G.: 1988, M.N.R.A.S. 230, 511 CrossRefGoogle Scholar
Smith, L.F., Maeder, A.: 1990, Astron. Astrophys. in press Google Scholar
St. Louis, N., Moffat, A.F.J., Drissen, L., Bastien, P., Robert, C.: 1988, Astrophys. J. 330, 286 CrossRefGoogle Scholar