Hostname: page-component-5c6d5d7d68-wp2c8 Total loading time: 0 Render date: 2024-08-29T15:10:01.330Z Has data issue: false hasContentIssue false
  • English
  • Français

One step closer to the First Stars: +150 OB stars in the metal-poor galaxy Sextans A

Published online by Cambridge University Press:  29 August 2024

Marta Lorenzo Open the ORCID record for Marta Lorenzo [Opens in a new window] ,
Miriam Garcia Open the ORCID record for Miriam Garcia [Opens in a new window]  and
Francisco Najarro Open the ORCID record for Francisco Najarro [Opens in a new window]
Marta Lorenzo*
Affiliation:
Centro de Astrobiología, CSIC-INTA, Crtra. de Torrejón a Ajalvir km 4. 28850 Torrejón de Ardoz (Madrid), Spain
Miriam Garcia
Affiliation:
Centro de Astrobiología, CSIC-INTA, Crtra. de Torrejón a Ajalvir km 4. 28850 Torrejón de Ardoz (Madrid), Spain
Francisco Najarro
Affiliation:
Centro de Astrobiología, CSIC-INTA, Crtra. de Torrejón a Ajalvir km 4. 28850 Torrejón de Ardoz (Madrid), Spain
*
*email: mlorenzo@cab.inta-csic.es
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.

Local Group (LG) very metal-poor massive stars are the best proxy for the First Stars of the Universe, fundamental to model the early evolution of the first galaxies, and key to unravelling new evolutionary pathways restricted to low metallicities, such as chemically homogeneous evolution. Yet, due to the great leap in distance required to reach metal-poor galaxies of the LG and vicinity, no comprehensive spectroscopic studies have been carried out at sub-$$$$ metallicities so far.

We focus on the massive star population of the 1/10Ȯ galaxy Sextans A. After five observing campaigns at the 10.4-m Gran Telescopio Canarias (GTC), we have assembled a spectroscopic catalogue of more than 150 OB stars. This catalogue will be fundamental to test stellar evolution at very low metallicity, to detect the first binary systems at 1/10Ȯ and to unveil the most recent star formation history of this galaxy.

Keywords

Stars: early-typestars: Population IIIgalaxies: stellar contentgalaxies: individual (Sextans A)catalogs
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 52 - 57
Check for updates
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

Berg, D. A., et al. 2012, ApJ, 754, 98 10.1088/0004-637X/754/2/98CrossRefGoogle Scholar
Camacho, I., Garcia, M., Herrero, A., & Simón-Daz, S. 2016, A&A, 585, A82,Google Scholar
Garcia, M., Herrero, A., Najarro, F., Camacho, I., Lennon, D. J., Urbaneja, M. A., & , N. 2017, in The Lives and Death-Throes of Massive Stars, ed. J. J. Eldridge, J. C. Bray, L. A. S. McClelland, & L. Xiao, Vol. 329, 313–321 10.1017/S1743921317003088CrossRefGoogle Scholar
Garcia, M., Herrero, A., Najarro, F., Camacho, I., & Lorenzo, M. 2019, MNRAS, 484, 422 Google Scholar
Groh, J. H., et al. 2019, A&A, 627, A24 Google Scholar
Hunter, D. A., et al. 2012, AJ, 144, 134 10.1088/0004-6256/144/5/134CrossRefGoogle Scholar
Kaufer, A., Venn, K. A., Tolstoy, E., Pinte, C., & Kudritzki, R.-P. 2004, AJ, 127, 2723 10.1086/383209CrossRefGoogle Scholar
Kniazev, A. Y., Grebel, E. K., Pustilnik, S. A., Pramskij, A. G., & Zucker, D. B. 2005, AJ, 130, 1558 10.1086/432931CrossRefGoogle Scholar
Massey, P., McNeill, R. T., Olsen, K. A. G., Hodge, P. W., Blaha, C., Jacoby, G. H., Smith, R. C., & Strong, S. B. 2007, AJ, 134, 2474 10.1086/523658CrossRefGoogle Scholar
Pilyugin, L. S. 2001, A&A, 369, 594 Google Scholar
Renzo, M., et al. 2019, A&A, 624, A66 Google Scholar
Shenar, T., et al. 2020, A&A, 641, C2 Google Scholar
Skillman, E. D., Terlevich, R., & Melnick, J. 1989, MNRAS, 240, 563 10.1093/mnras/240.3.563CrossRefGoogle Scholar
Szécsi, D., Agrawal, P., Wünsch, R., & Langer, N. 2022, A&A, 658, A125 Google Scholar
Szécsi, D., Langer, N., Yoon, S.-C., Sanyal, D., de Mink, S., Evans, C. J., & Dermine, T. 2015, A&A, 581, A15 Google Scholar
Tammann, G. A., Reindl, B., & Sandage, A. 2011, A&A, 531, A134 Google Scholar