Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters

To better understand the mixing and mass loss experienced by low-mass stars as they ascend the asymptotic giant branch (AGB), I have gathered from the literature the abundances of CNO and s -process elements in post-AGB stars in Galactic globular clusters. These species are mixed to the surface duri...
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Autor*in:	William V. Dixon [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2024

Schlagwörter:	Stellar abundances Asymptotic giant branch stars Post-asymptotic giant branch stars Stellar atmospheres

Übergeordnetes Werk:	In: The Astrophysical Journal - IOP Publishing, 2022, 961(2024), 1, p 24
Übergeordnetes Werk:	volume:961 ; year:2024 ; number:1, p 24

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/1538-4357/ad0a89

Katalog-ID:	DOAJ097737585

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callnumber-first	Q - Science
author	William V. Dixon
spellingShingle	William V. Dixon misc QB460-466 misc Stellar abundances misc Asymptotic giant branch stars misc Post-asymptotic giant branch stars misc Stellar atmospheres misc Astrophysics Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters
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topic_title	QB460-466 Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters Stellar abundances Asymptotic giant branch stars Post-asymptotic giant branch stars Stellar atmospheres
topic	misc QB460-466 misc Stellar abundances misc Asymptotic giant branch stars misc Post-asymptotic giant branch stars misc Stellar atmospheres misc Astrophysics
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title	Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters
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title_sort	evidence of third dredge-up in post-agb stars in galactic globular clusters
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title_auth	Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters
abstract	To better understand the mixing and mass loss experienced by low-mass stars as they ascend the asymptotic giant branch (AGB), I have gathered from the literature the abundances of CNO and s -process elements in post-AGB stars in Galactic globular clusters. These species are mixed to the surface during third dredge-up (3DU) events, so their abundance should increase as the star ascends the AGB. Of the 17 stars in this sample, CNO abundances are available for 11. Of these, four are enhanced in CNO relative to the red giant branch stars from which they descended, which I take as evidence of 3DU on the AGB. The enhancement is mainly in the form of carbon. Of the six stars for which only heavy-element abundances are available, one shows s -process enhancements that previous authors have interpreted as evidence of 3DU. Combining these 17 stars with other recent samples reveals that most globular-cluster post-AGB stars have luminosities $\mathrm{log}(L/{L}_{\odot })\sim 3.25$ . They are the progeny of blue horizontal-branch (HB) stars in clusters with intermediate metallicity ([Fe/H] ∼ −1.5). A second group consists of sub-luminous stars associated with high-metallicity clusters ([Fe/H] ∼ −1.0) with red HBs. They may be burning helium, rather than hydrogen. A third group of hot, super-luminous stars is evolving quickly across the Hertzsprung–Russell diagram. Some of them may be merger remnants.
abstractGer	To better understand the mixing and mass loss experienced by low-mass stars as they ascend the asymptotic giant branch (AGB), I have gathered from the literature the abundances of CNO and s -process elements in post-AGB stars in Galactic globular clusters. These species are mixed to the surface during third dredge-up (3DU) events, so their abundance should increase as the star ascends the AGB. Of the 17 stars in this sample, CNO abundances are available for 11. Of these, four are enhanced in CNO relative to the red giant branch stars from which they descended, which I take as evidence of 3DU on the AGB. The enhancement is mainly in the form of carbon. Of the six stars for which only heavy-element abundances are available, one shows s -process enhancements that previous authors have interpreted as evidence of 3DU. Combining these 17 stars with other recent samples reveals that most globular-cluster post-AGB stars have luminosities $\mathrm{log}(L/{L}_{\odot })\sim 3.25$ . They are the progeny of blue horizontal-branch (HB) stars in clusters with intermediate metallicity ([Fe/H] ∼ −1.5). A second group consists of sub-luminous stars associated with high-metallicity clusters ([Fe/H] ∼ −1.0) with red HBs. They may be burning helium, rather than hydrogen. A third group of hot, super-luminous stars is evolving quickly across the Hertzsprung–Russell diagram. Some of them may be merger remnants.
abstract_unstemmed	To better understand the mixing and mass loss experienced by low-mass stars as they ascend the asymptotic giant branch (AGB), I have gathered from the literature the abundances of CNO and s -process elements in post-AGB stars in Galactic globular clusters. These species are mixed to the surface during third dredge-up (3DU) events, so their abundance should increase as the star ascends the AGB. Of the 17 stars in this sample, CNO abundances are available for 11. Of these, four are enhanced in CNO relative to the red giant branch stars from which they descended, which I take as evidence of 3DU on the AGB. The enhancement is mainly in the form of carbon. Of the six stars for which only heavy-element abundances are available, one shows s -process enhancements that previous authors have interpreted as evidence of 3DU. Combining these 17 stars with other recent samples reveals that most globular-cluster post-AGB stars have luminosities $\mathrm{log}(L/{L}_{\odot })\sim 3.25$ . They are the progeny of blue horizontal-branch (HB) stars in clusters with intermediate metallicity ([Fe/H] ∼ −1.5). A second group consists of sub-luminous stars associated with high-metallicity clusters ([Fe/H] ∼ −1.0) with red HBs. They may be burning helium, rather than hydrogen. A third group of hot, super-luminous stars is evolving quickly across the Hertzsprung–Russell diagram. Some of them may be merger remnants.
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title_short	Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters
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Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters

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