{"title":"Evolution of lithium in the disc of the Galaxy and the role of novae","authors":"Sviatoslav Borisov, Nikos Prantzos, Corinne Charbonnel","doi":"10.1051/0004-6361/202451321","DOIUrl":null,"url":null,"abstract":"<i>Context.<i/> Lithium plays a crucial role in probing stellar physics, stellar and primordial nucleosynthesis, and the chemical evolution of the Galaxy. Stars are considered to be the main source of Li, yet the identity of its primary stellar producer has long been a matter of debate.<i>Aims.<i/> In light of recent theoretical and observational results, we investigate in this study the role of two candidate sources of Li enrichment in the Milky Way, namely asymptotic giant branch (AGB) stars and, in particular, novae.<i>Methods.<i/> We utilised a one-zone Galactic chemical evolution (GCE) model to assess the viability of AGB stars and novae as stellar sources of Li. We used recent theoretical Li yields for AGB stars, while for novae we adopted observationally inferred Li yields and recently derived delay time distributions (DTDs). Subsequently, we extended our analysis by using a multi-zone model with radial migration to investigate spatial variations in the evolution of Li across the Milky Way disc and compared the results with observational data for field stars and open clusters.<i>Results.<i/> Our analysis shows that AGB stars clearly fail to reproduce the meteoritic Li abundance. In contrast, novae appear as promising candidates within the adopted framework, allowing us to quantify the contribution of each Li source at the Sun’s formation and today. Our multi-zone model reveals the role of the differences in the DTDs of Type Ia supernovae and novae in shaping the evolution of Li in the various galactic zones. Its results are in fair agreement with the observational data for most open clusters, but small discrepancies appear in the outer disc.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":null,"pages":null},"PeriodicalIF":5.4000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astronomy & Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1051/0004-6361/202451321","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
Context. Lithium plays a crucial role in probing stellar physics, stellar and primordial nucleosynthesis, and the chemical evolution of the Galaxy. Stars are considered to be the main source of Li, yet the identity of its primary stellar producer has long been a matter of debate.Aims. In light of recent theoretical and observational results, we investigate in this study the role of two candidate sources of Li enrichment in the Milky Way, namely asymptotic giant branch (AGB) stars and, in particular, novae.Methods. We utilised a one-zone Galactic chemical evolution (GCE) model to assess the viability of AGB stars and novae as stellar sources of Li. We used recent theoretical Li yields for AGB stars, while for novae we adopted observationally inferred Li yields and recently derived delay time distributions (DTDs). Subsequently, we extended our analysis by using a multi-zone model with radial migration to investigate spatial variations in the evolution of Li across the Milky Way disc and compared the results with observational data for field stars and open clusters.Results. Our analysis shows that AGB stars clearly fail to reproduce the meteoritic Li abundance. In contrast, novae appear as promising candidates within the adopted framework, allowing us to quantify the contribution of each Li source at the Sun’s formation and today. Our multi-zone model reveals the role of the differences in the DTDs of Type Ia supernovae and novae in shaping the evolution of Li in the various galactic zones. Its results are in fair agreement with the observational data for most open clusters, but small discrepancies appear in the outer disc.
背景。锂在探测恒星物理学、恒星和原始核合成以及银河系的化学演化方面发挥着至关重要的作用。恒星被认为是锂的主要来源,然而锂的主要恒星生产者是谁一直是个争论不休的问题。 目的:根据最近的理论和观测结果,我们在本研究中调查了银河系中两个锂富集候选来源的作用,即渐近巨枝(AGB)恒星,特别是新星。我们利用单区银河化学演化(GCE)模型来评估AGB恒星和新星作为Li恒星来源的可行性。对于AGB恒星,我们采用了最新的理论锂产率;对于新星,我们采用了观测推断的锂产率和最新得出的延迟时间分布(DTD)。随后,我们通过使用具有径向迁移的多区模型扩展了我们的分析,研究了整个银河系圆盘中 Li 演变的空间变化,并将结果与野外恒星和疏散星团的观测数据进行了比较。我们的分析表明,AGB恒星显然无法再现陨星的Li丰度。与此相反,新星在所采用的框架内似乎是很有希望的候选者,使我们能够量化每个锂源在太阳形成和今天的贡献。我们的多区模型揭示了 Ia 型超新星和新星的 DTDs 差异在塑造不同星系区 Li 演变中的作用。其结果与大多数疏散星团的观测数据相当吻合,但在外层圆盘出现了微小的差异。
期刊介绍:
Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.