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27 April 2024 |
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The ubiquitous nature of the Horizontal Branch second U-jump: A link with the Blue Hook scenario? | | Y. Momany
; L. R. Bedin
; S. Cassisi
; G. Piotto
; S. Ortolani
; A. Recio-Blanco
; F. De Angeli
; F. Castelli
; | | Date: |
25 Feb 2004 | | Journal: | Astron.Astrophys. 420 (2004) 605-617 | | Subject: | astro-ph | | Abstract: | In a previous paper we reported on a discontinuity in the extreme horizontal branch (EHB) of the Galactic globular cluster NGC6752, which we called the second U-jump. This feature was attributed to a combination of post zero-age horizontal branch evolution and diffusion effects. In this follow-up study we analyze other EHB clusters and show that the second U-jump is a common feature among EHB clusters reaching T_{eff}ge 23,000K, and that its onset in different clusters converges around T_{eff}sim 21,000pm3,000K. We also present near-ultraviolet diagrams of omega Cen and NGC2808, the only two objects with spectroscopically confirmed ``blue hook’’ stars (T_{eff}ge 35,000K). We confirm predictions of a photometric discontinuity separating late from early-helium flashers. Moreover, we present empirical evidence that the second U-jump population might be mainly composed by early-helium flashers. Lastly, we revisit the discussion on the ubiquitous nature of the gaps and jumps so far identified in the blue HB tails, suggesting a possible discrete nature of the distribution in temperature of the HB stars. | | Source: | arXiv, astro-ph/0402594 | | Services: | Forum | Review | PDF | Favorites | |
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