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• W3105110964 endingPage "106" @default.
• W3105110964 startingPage "106" @default.
• W3105110964 abstract "Taking advantage of a recent FORS2/VLT spectroscopic sample of Extreme Horizontal Branch (EHB) stars in $omega$ Cen, we isolate 38 spectra well suited for detailed atmospheric studies and determine their fundamental parameters ($T_{rm eff}$, log $g$, and log $N$(He)/$N$(H)) using NLTE, metal line-blanketed models. We find that our targets can be divided into three groups: 6 stars are hot ($T_{rm eff}$$buildrel>oversim $ 45,000 K) H-rich subdwarf O stars, 7 stars are typical H-rich sdB stars ($T_{rm eff}$$ buildrel<oversim $35,000 K), and the remaining 25 targets at intermediate effective temperatures are He-rich (log $N$(He)/$N$(H)$ buildrel>oversim $ $-$1.0) subdwarfs. Surprisingly and quite interestingly, these He-rich hot subdwarfs in $omega$ Cen cluster in a narrow temperature range ($sim$35,000 K to $sim$40,000 K). We additionally measure the atmospheric carbon abundance and find a most interesting positive correlation between the carbon and helium atmospheric abundances. This correlation certainly bears the signature of diffusion processes - most likely gravitational settling impeded by stellar winds or internal turbulence - but also constrains possible formation scenarios proposed for EHB stars in $omega$ Cen. For the He-rich objects in particular, the clear link between helium and carbon enhancement points towards a late hot flasher evolutionary history." @default.
• W3105110964 created "2020-11-23" @default.
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• W3105110964 date "2014-10-17" @default.
• W3105110964 modified "2023-10-02" @default.
• W3105110964 title "A HELIUM-CARBON CORRELATION ON THE EXTREME HORIZONTAL BRANCH IN ω CENTAURI" @default.
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• W3105110964 doi "https://doi.org/10.1088/0004-637x/795/2/106" @default.
• W3105110964 hasPublicationYear "2014" @default.
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