arXiv: Astrophysics
Read
First stars as a possible origin for the helium-rich population in omega Centauri
Abstract
The most massive Galactic globular cluster omega Cen appears to have two, or perhaps more, distinct main sequences. Its bluest main sequence is at the centre of debate because it has been suggested to have an extremely high helium abundance of Y ~ 0.4. The same helium abundance is claimed to explain the presence of extreme horizontal branch stars of omega Cen as well. This demands a relative helium to metal enrichment of deltaY/deltaZ ~ 70; that is, more than one order of magnitude larger than the generally accepted value. Candidate solutions, namely, AGB stars, massive stars, and supernovae, have been suggested; but in this study, we show that none of them is a viable channel, in terms of reproducing the high value of deltaY/deltaZ for the constrained age difference between the red and blue populations. Essentially no populations with an ordinary initial mass function, including those candidates, can produce such a high deltaY/deltaZ because they all produce metals as well as helium. As an alternative, we investigate the possibility of the stochastic ``first star'' contamination to the gas from which the younger generation of omega Cen formed. This requires the assumption that Population III star formation episode overlaps with that of Population II. While the required condition appears extreme, very massive objects in the first star generation provide a solution that is at least as plausible as any other suggestions made before.
Concepts
Bluest Main Sequence Omega Cen AGB Stars Blue Populations Helium Abundance Candidate Solutions Massive Objects Main Sequence Massive Globular Cluster Massive Stars
Introducing Weekly Round-ups!Beta
Round-ups are the summaries of handpicked papers around trending topics published every week. These would enable you to scan through a collection of papers and decide if the paper is relevant to you before actually investing time into reading it.
Climate change Research Articles published between Jan 16, 2023 to Jan 22, 2023
Carbon capture and utilization (CCU) is an emerging technology with commercial potential to convert atmospheric carbon dioxide (CO2) into net zero or ...
Read MoreQuality Of Education Research Articles published between Jan 16, 2023 to Jan 22, 2023
Introduction: The Educational Scholar Program (ESP) is a creative method to focus on the quality of education and the scholarship of education. The ed...
Read MoreGender Equality Research Articles published between Jan 16, 2023 to Jan 22, 2023
This study deviates from the predominantly feminist/critical school of thought associated with existing gender studies to apply an interpretivist appr...
Read MoreDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on “as is” basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The Copyright Law.