Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants

In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-...
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Gespeichert in:

Autor*in:	Anohita Mallick [verfasserIn] Raghubar Singh [verfasserIn] Bacham E. Reddy [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Stellar abundances Red giant clump Helium burning Asteroseismology

Übergeordnetes Werk:	In: The Astrophysical Journal Letters - IOP Publishing, 2022, 944(2023), 1, p L5
Übergeordnetes Werk:	volume:944 ; year:2023 ; number:1, p L5

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/2041-8213/acb5f6

Katalog-ID:	DOAJ08915553X

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allfields	10.3847/2041-8213/acb5f6 doi (DE-627)DOAJ08915553X (DE-599)DOAJbc69997b7b3848eeb4a0ac1df3741327 DE-627 ger DE-627 rakwb eng QB460-466 Anohita Mallick verfasserin aut Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash. Stellar abundances Red giant clump Helium burning Asteroseismology Astrophysics Raghubar Singh verfasserin aut Bacham E. Reddy verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 944(2023), 1, p L5 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:944 year:2023 number:1, p L5 https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/article/bc69997b7b3848eeb4a0ac1df3741327 kostenfrei https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 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 944 2023 1, p L5
spelling	10.3847/2041-8213/acb5f6 doi (DE-627)DOAJ08915553X (DE-599)DOAJbc69997b7b3848eeb4a0ac1df3741327 DE-627 ger DE-627 rakwb eng QB460-466 Anohita Mallick verfasserin aut Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash. Stellar abundances Red giant clump Helium burning Asteroseismology Astrophysics Raghubar Singh verfasserin aut Bacham E. Reddy verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 944(2023), 1, p L5 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:944 year:2023 number:1, p L5 https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/article/bc69997b7b3848eeb4a0ac1df3741327 kostenfrei https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 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 944 2023 1, p L5
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allfieldsGer	10.3847/2041-8213/acb5f6 doi (DE-627)DOAJ08915553X (DE-599)DOAJbc69997b7b3848eeb4a0ac1df3741327 DE-627 ger DE-627 rakwb eng QB460-466 Anohita Mallick verfasserin aut Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash. Stellar abundances Red giant clump Helium burning Asteroseismology Astrophysics Raghubar Singh verfasserin aut Bacham E. Reddy verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 944(2023), 1, p L5 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:944 year:2023 number:1, p L5 https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/article/bc69997b7b3848eeb4a0ac1df3741327 kostenfrei https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 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 944 2023 1, p L5
allfieldsSound	10.3847/2041-8213/acb5f6 doi (DE-627)DOAJ08915553X (DE-599)DOAJbc69997b7b3848eeb4a0ac1df3741327 DE-627 ger DE-627 rakwb eng QB460-466 Anohita Mallick verfasserin aut Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash. Stellar abundances Red giant clump Helium burning Asteroseismology Astrophysics Raghubar Singh verfasserin aut Bacham E. Reddy verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 944(2023), 1, p L5 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:944 year:2023 number:1, p L5 https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/article/bc69997b7b3848eeb4a0ac1df3741327 kostenfrei https://doi.org/10.3847/2041-8213/acb5f6 kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2522 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 944 2023 1, p L5
language	English
source	In The Astrophysical Journal Letters 944(2023), 1, p L5 volume:944 year:2023 number:1, p L5
sourceStr	In The Astrophysical Journal Letters 944(2023), 1, p L5 volume:944 year:2023 number:1, p L5
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Stellar abundances Red giant clump Helium burning Asteroseismology Astrophysics
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container_title	The Astrophysical Journal Letters
authorswithroles_txt_mv	Anohita Mallick @@aut@@ Raghubar Singh @@aut@@ Bacham E. Reddy @@aut@@
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callnumber-first	Q - Science
author	Anohita Mallick
spellingShingle	Anohita Mallick misc QB460-466 misc Stellar abundances misc Red giant clump misc Helium burning misc Asteroseismology misc Astrophysics Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants
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topic_title	QB460-466 Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants Stellar abundances Red giant clump Helium burning Asteroseismology
topic	misc QB460-466 misc Stellar abundances misc Red giant clump misc Helium burning misc Asteroseismology misc Astrophysics
topic_unstemmed	misc QB460-466 misc Stellar abundances misc Red giant clump misc Helium burning misc Asteroseismology misc Astrophysics
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title	Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants
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title_full	Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants
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title_sort	lithium abundances in giants as a function of stellar mass: evidence for he flash as the source of li enhancement in low-mass giants
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title_auth	Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants
abstract	In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash.
abstractGer	In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash.
abstract_unstemmed	In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The asteroseismic Δ P –Δ ν diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters Δ P (or ΔΠ _1 ) and Δ ν are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (≤2 M _⊙ ) primary red clump giants and 109 high-mass (<2 M _⊙ ) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ≈2 M _⊙ develop a degenerate He core and undergo He flash.
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title_short	Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants
url	https://doi.org/10.3847/2041-8213/acb5f6 https://doaj.org/article/bc69997b7b3848eeb4a0ac1df3741327 https://doaj.org/toc/2041-8205
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up_date	2024-07-03T21:34:30.789Z
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Lithium Abundances in Giants as a Function of Stellar Mass: Evidence for He Flash as the Source of Li Enhancement in Low-mass Giants

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