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Metallicity Effects on Starburst

Published online by Cambridge University Press:  10 November 2010

G. Tenorio-Tagle
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
M. Cerviño
Affiliation:
Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain
J. M. Mas-Hesse
Affiliation:
Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain
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Summary

Evolutionary stellar population synthesis models have been performed for several metallicities and two extreme star formation rates, instantaneous (IB) and extended bursts (EB). We discuss the dependence on metallicity of the population of Wolf-Rayet (WR) and Red Supergiant (RSG) stars. We show that both populations become more abundant for higher metallicities. We also show the effects of metallicity on the effective temperature and Hβ equivalent width. These effects are independent of the IMF slope and can account, at least in part, for the higher values of Teff and W(Hβ) systematically found in low-metallicity star formation episodes.

A more complete study can be found in Cerviño & Mas-Hesse (1994).

Wolf-Rayet population

In Figure 1a we compare observational values of WR bump over Hβ ratio taken from Kunth & Joubert (1985), Kunth & Schild (1986) and Vacca & Conti (1992) with the model predictions. Ages have been estimated by using the W(Hβ) computed for a Salpeter IMF slope (Figure lb). The average WR bump over Hβ intensities fall within the range predicted by our models for an IB regime and cannot be reproduced assuming an extended one. We can therefore reject the possibility of having extended star formation episodes in the majority of the cases, and can also constrain the age of the episodes to a short range between 3 and 5 Myr after the onset of the burst.

Type
Chapter
Information
Violent Star Formation
From 30 Doradus to QSOs
, pp. 327 - 328
Publisher: Cambridge University Press
Print publication year: 1994

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  • Metallicity Effects on Starburst
    • By M. Cerviño, Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain, J. M. Mas-Hesse, Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.059
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  • Metallicity Effects on Starburst
    • By M. Cerviño, Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain, J. M. Mas-Hesse, Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.059
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Metallicity Effects on Starburst
    • By M. Cerviño, Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain, J. M. Mas-Hesse, Laboratorio de Astrofísica Espacial y Física Fundamental, POB 50727 E-28080 Madrid, Spain
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.059
Available formats
×