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- W2782344676 abstract "We show that the recent realization that isolated post-extreme horizontal branch (post-EHB) stars are generally characterized by rotational broadening with values of V rot sin i between 25 and 30 km s −1 can be explained as a natural consequence of the conservation of angular momentum from the previous He-core burning phase on the EHB. The progenitors of these evolved objects, the EHB stars, are known to be slow rotators with an average value of V rot sin i of ~7.7 km s −1 . This implies significant spin-up between the EHB and post-EHB phases. Using representative evolutionary models of hot subdwarf stars, we demonstrate that angular momentum conservation in uniformly rotating structures (rigid-body rotation) boosts that value of the projected equatorial rotation speed by a factor ~3.6 by the time the model has reached the region of the surface gravity-effective temperature plane where the newly-studied post-EHB objects are found. This is exactly what is needed to account for their observed atmospheric broadening. We note that the decrease of the moment of inertia causing the spin-up is mostly due to the redistribution of matter that produces more centrally-condensed structures in the post-EHB phase of evolution, not to the decrease of the radius per se." @default.
- W2782344676 created "2018-01-12" @default.
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- W2782344676 date "2018-05-01" @default.
- W2782344676 modified "2023-10-02" @default.
- W2782344676 title "Rotational broadening and conservation of angular momentum in post-extreme horizontal branch stars" @default.
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- W2782344676 doi "https://doi.org/10.1051/0004-6361/201732287" @default.
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