On the 3He anomaly in hot subdwarf B stars

Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Schneider David [verfasserIn] Irrgang Andreas [verfasserIn] Heber Ulrich [verfasserIn] Nieva Maria F. [verfasserIn] Przybilla Norbert [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2017

Schlagwörter:	stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch

Übergeordnetes Werk:	In: Open Astronomy - De Gruyter, 2018, 26(2017), 1, Seite 139-151
Übergeordnetes Werk:	volume:26 ; year:2017 ; number:1 ; pages:139-151

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1515/astro-2017-0430

Katalog-ID:	DOAJ014546922

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spelling	10.1515/astro-2017-0430 doi (DE-627)DOAJ014546922 (DE-599)DOAJ19c366c6b1c741db8d7af608de575ad7 DE-627 ger DE-627 rakwb eng QB1-991 Schneider David verfasserin aut On the 3He anomaly in hot subdwarf B stars 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification. stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch Astronomy Irrgang Andreas verfasserin aut Heber Ulrich verfasserin aut Nieva Maria F. verfasserin aut Przybilla Norbert verfasserin aut In Open Astronomy De Gruyter, 2018 26(2017), 1, Seite 139-151 (DE-627)1000905144 (DE-600)2908865-3 25436376 nnns volume:26 year:2017 number:1 pages:139-151 https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/article/19c366c6b1c741db8d7af608de575ad7 kostenfrei https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/toc/2543-6376 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2017 1 139-151
allfields_unstemmed	10.1515/astro-2017-0430 doi (DE-627)DOAJ014546922 (DE-599)DOAJ19c366c6b1c741db8d7af608de575ad7 DE-627 ger DE-627 rakwb eng QB1-991 Schneider David verfasserin aut On the 3He anomaly in hot subdwarf B stars 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification. stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch Astronomy Irrgang Andreas verfasserin aut Heber Ulrich verfasserin aut Nieva Maria F. verfasserin aut Przybilla Norbert verfasserin aut In Open Astronomy De Gruyter, 2018 26(2017), 1, Seite 139-151 (DE-627)1000905144 (DE-600)2908865-3 25436376 nnns volume:26 year:2017 number:1 pages:139-151 https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/article/19c366c6b1c741db8d7af608de575ad7 kostenfrei https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/toc/2543-6376 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2017 1 139-151
allfieldsGer	10.1515/astro-2017-0430 doi (DE-627)DOAJ014546922 (DE-599)DOAJ19c366c6b1c741db8d7af608de575ad7 DE-627 ger DE-627 rakwb eng QB1-991 Schneider David verfasserin aut On the 3He anomaly in hot subdwarf B stars 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification. stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch Astronomy Irrgang Andreas verfasserin aut Heber Ulrich verfasserin aut Nieva Maria F. verfasserin aut Przybilla Norbert verfasserin aut In Open Astronomy De Gruyter, 2018 26(2017), 1, Seite 139-151 (DE-627)1000905144 (DE-600)2908865-3 25436376 nnns volume:26 year:2017 number:1 pages:139-151 https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/article/19c366c6b1c741db8d7af608de575ad7 kostenfrei https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/toc/2543-6376 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2017 1 139-151
allfieldsSound	10.1515/astro-2017-0430 doi (DE-627)DOAJ014546922 (DE-599)DOAJ19c366c6b1c741db8d7af608de575ad7 DE-627 ger DE-627 rakwb eng QB1-991 Schneider David verfasserin aut On the 3He anomaly in hot subdwarf B stars 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification. stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch Astronomy Irrgang Andreas verfasserin aut Heber Ulrich verfasserin aut Nieva Maria F. verfasserin aut Przybilla Norbert verfasserin aut In Open Astronomy De Gruyter, 2018 26(2017), 1, Seite 139-151 (DE-627)1000905144 (DE-600)2908865-3 25436376 nnns volume:26 year:2017 number:1 pages:139-151 https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/article/19c366c6b1c741db8d7af608de575ad7 kostenfrei https://doi.org/10.1515/astro-2017-0430 kostenfrei https://doaj.org/toc/2543-6376 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 26 2017 1 139-151
language	English
source	In Open Astronomy 26(2017), 1, Seite 139-151 volume:26 year:2017 number:1 pages:139-151
sourceStr	In Open Astronomy 26(2017), 1, Seite 139-151 volume:26 year:2017 number:1 pages:139-151
format_phy_str_mv	Article
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topic_facet	stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch Astronomy
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container_title	Open Astronomy
authorswithroles_txt_mv	Schneider David @@aut@@ Irrgang Andreas @@aut@@ Heber Ulrich @@aut@@ Nieva Maria F. @@aut@@ Przybilla Norbert @@aut@@
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callnumber-first	Q - Science
author	Schneider David
spellingShingle	Schneider David misc QB1-991 misc stars: chemically peculiar misc stars: atmospheres misc stars: fundamental parameters misc stars: abundances misc subdwarfs misc stars: horizontal-branch misc Astronomy On the 3He anomaly in hot subdwarf B stars
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topic_title	QB1-991 On the 3He anomaly in hot subdwarf B stars stars: chemically peculiar stars: atmospheres stars: fundamental parameters stars: abundances subdwarfs stars: horizontal-branch
topic	misc QB1-991 misc stars: chemically peculiar misc stars: atmospheres misc stars: fundamental parameters misc stars: abundances misc subdwarfs misc stars: horizontal-branch misc Astronomy
topic_unstemmed	misc QB1-991 misc stars: chemically peculiar misc stars: atmospheres misc stars: fundamental parameters misc stars: abundances misc subdwarfs misc stars: horizontal-branch misc Astronomy
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title	On the 3He anomaly in hot subdwarf B stars
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title_full	On the 3He anomaly in hot subdwarf B stars
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author_browse	Schneider David Irrgang Andreas Heber Ulrich Nieva Maria F. Przybilla Norbert
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title_sort	on the 3he anomaly in hot subdwarf b stars
callnumber	QB1-991
title_auth	On the 3He anomaly in hot subdwarf B stars
abstract	Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification.
abstractGer	Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification.
abstract_unstemmed	Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere of these stars lead to the observed abundance anomalies. Quantitative spectral analyses of high-resolution spectra to derive photospheric isotopic helium abundance ratios for known 3He sdBs have not been performed yet. We present preliminary results of high-resolution and high S/N spectra to determine the 3He and 4He abundances of nine known 3He sdBs. We used a hybrid local/non-local thermodynamic equilibrium (LTE/NLTE) approach for B-type stars investigating multiple He i lines, including λ4922 Å and λ6678 Å, which show the strongest isotopic shifts in the optical spectral range.We also report the discovery of four new 3He sdBs from the ESO Supernova Progenitor survey. Most of the 3He sdBs cluster in a narrow temperature strip between ∼ 26000 K and ∼ 30000 K and have almost no atmospheric 4He at all. Interestingly, three 3He sdBs show evidence for vertical helium stratification.
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title_short	On the 3He anomaly in hot subdwarf B stars
url	https://doi.org/10.1515/astro-2017-0430 https://doaj.org/article/19c366c6b1c741db8d7af608de575ad7 https://doaj.org/toc/2543-6376
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On the 3He anomaly in hot subdwarf B stars

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