Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-10T14:25:52.020Z Has data issue: false hasContentIssue false
  • English
  • Français

Massive variable stars at very low metallicity?

Published online by Cambridge University Press:  12 July 2011

Dominik J. Bomans  and
Kerstin Weis
Dominik J. Bomans
Affiliation:
Astronomical Institute, Ruhr-University Bochum, Universitätsstr. 150, 44801, Bochum, Germany email: bomans@astro.rub.de, kweis@astro.rub.de
Kerstin Weis
Affiliation:
Astronomical Institute, Ruhr-University Bochum, Universitätsstr. 150, 44801, Bochum, Germany email: bomans@astro.rub.de, kweis@astro.rub.de
Rights & Permissions [Opens in a new window]

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.

Observational contraints on the evolution and instabilities of massive stars at very low metallicities are limited. Most of the information come from HST observations of one target, I Zw 18. Recent distance estimates of I Zw 18 put it at 17 Mpc, moving detailed studies of single stars clearly beyond the range of current ground based telescopes. Since massive stars with metallcities of 1/10 of solar and below are our best proxies for massive stars in (proto-) galaxies around the time of reionization, finding them and studying their evolution and instabilities is of premium importance for our understanding of galaxy formation, feedback, and the IGM reionization. Here we present pilot study results of variable stars in two more nearby extremely low metallicity galaxies, UGC 5340 and UGCA 292, and comment on the possibilities of more detailed studies of variable massive stars with new ground-based instrumentation.

Keywords

stars: variables: otherstars: evolutionstars: early-type(stars:) supergiantsstars: windsoutflowsgalaxies: stellar contentgalaxies: irregularinstrumentation: spectrographs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 265 - 270
Copyright
Copyright © International Astronomical Union 2011

References

Aloisi, A., Clementini, G., Tosi, M., Annibali, F. et al. 2007, ApJ (Letters), 667, L151CrossRefGoogle Scholar
Bomans, D.J., et al. 2010, in: Williams, P. & Rauw, G. (eds.), The multi-wavelength view of Hot, Massive Stars, 39th Liège International Astrophysical Colloquium, in pressGoogle Scholar
Bresolin, F., Kudritzki, R.-P., Mendez, R. H. & Przybilla, N. 2001, ApJ (Letters), 548, L159CrossRefGoogle Scholar
Drissen, L., Crowther, P. A., Smith, L. J., Robert, C. et al. 2001, ApJ, 546, 484CrossRefGoogle Scholar
van Eymeren, J., Marcelin, M., Koribalski, B., Dettmar, R.-J. et al. 2009, A&A, 493, 511Google Scholar
Fiorentino, G., Contreras Ramos, R., Clementini, G., Marconi, M. et al. 2010, ApJ, 711, 808CrossRefGoogle Scholar
van Genderen, A. M. 2001, A&A, 366, 508Google Scholar
Heap, S. et al. 2010, in: Williams, P. & Rauw, G. (eds.), The multi-wavelength view of Hot, Massive Stars, 39th Liège International Astrophysical Colloquium, in pressGoogle Scholar
Herrero, A., Garcia, M., Uytterhoeven, K., Najarro, F. et al. 2010, A&A, 513, A70Google Scholar
Izotov, Y. I. & Thuan, T. X. 2009, ApJ, 690, 1797CrossRefGoogle Scholar
Kunth, D. & Östlin, G. 2000, A&AR, 10, 1Google Scholar
Lee, H., Skillman, E. D., Cannon, J. M., Jackson, D. C. et al. 2006, ApJ, 647, 970CrossRefGoogle Scholar
Lee, J. C., Kennicutt, R. C., José, G.Funes, S. J., Sakai, S. et al. 2009, ApJ, 692, 1305CrossRefGoogle Scholar
Leitherer, C., Robert, C. & Drissen, L. 1992, ApJ, 401, 596CrossRefGoogle Scholar
Martin, C. L. 1998, ApJ, 506, 222CrossRefGoogle Scholar
Meynet, G. & Maeder, A. 2005, A&A, 429, 581Google Scholar
Pastorello, A., Botticella, M. T., Trundle, C., Taubenberger, S. et al. 2010, MNRAS 408, 181CrossRefGoogle Scholar
Petit, V., Drissen, L., & Crowther, P. A. 2006, AJ, 132, 1756CrossRefGoogle Scholar
Pustilnik, S. A., Tepliakova, A. L., Kniazev, A. Y., & Burenkov, A. N. 2008, MNRAS, 388, L24CrossRefGoogle Scholar
Schaerer, D. & de Barros, S. 2010, A&A, 515, A73Google Scholar