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Dissecting the Gaia HR diagram within 200 pc
Dal Tio, Piero1,2; Mazzi, Alessandro1; Girardi, Leo2; Barbieri, Mauro3; Zaggia, Simone2; Bressan, Alessandro4; Chen, Yang1,5,6; Costa, Guglielmo1,2; Marigo, Paola1
2021-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume506Issue:4Pages:5681-5697
AbstractWe analyse the high-quality Hertzsprung-Russell diagram (HRD) derived from Gaia data release 2 for the Solar Neighbourhood. We start building an almost complete sample within 200 pc and for |b| > 25(circle), so as to limit the impact of known errors and artefacts in the Gaia catalogue. Particular effort is then put into improving the modelling of population of binaries, which produce two marked features in the HRD: the sequence of near-equal mass binaries along the lower main sequence, and the isolated group of hot subdwarfs. We describe a new tool, BinaPSE, to follow the evolution of interacting binaries in a way that improves the consistency with PARSEC evolutionary tracks for single stars. BinaPSE is implemented into the TRILEGAL code for the generation of 'partial models' for both single and binary stellar populations, taking into account the presence of resolved and unresolved binaries. We then fit the Gaia HRD via Markov chain Monte Carlo methods that search for the star formation history and an initial binary fraction (by mass) that maximize the likelihood. The main results are (i) the binary fraction derived from the lower MS is close to 0.4, while twice larger values are favoured when the upper part of the HRD is fitted; (ii) present models predict the observed numbers of hot subdwarfs to within a factor of 2; and (iii) irrespective of the prescription for the binaries, the star formation rate peaks at values similar to 1.5 x 10(-4) M(circle dot)yr(-1) at ages slightly above 2 Gyr, and then decreases to similar to 0.8 x 10(-4) M(circle dot)yr(-1) at very old ages.
Keywordbinaries: general Hertzsprung-Russell and colour-magnitude diagrams solar neighbourhood
Funding Organization`INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council ; `INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council ; `INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council ; `INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council
DOI10.1093/mnras/stab1964
WOS KeywordSTAR-FORMATION HISTORY ; INITIAL MASS FUNCTION ; SUBDWARF-B-STARS ; SOLAR NEIGHBORHOOD ; MILKY-WAY ; STELLAR POPULATIONS ; EVOLUTIONARY TRACKS ; BINARY STARS ; CATALOG ; ORIGIN
Language英语
Funding Project`INAF[1.05.01.86.20] ; European Union (ERC Consolidator Grant project STARKEY)[615604] ; PRIN MIUR 2017[20173ML3WW] ; NSFC[12003001] ; European Research Council[770017]
Funding Organization`INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council ; `INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council ; `INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council ; `INAF ; `INAF ; European Union (ERC Consolidator Grant project STARKEY) ; European Union (ERC Consolidator Grant project STARKEY) ; PRIN MIUR 2017 ; PRIN MIUR 2017 ; NSFC ; NSFC ; European Research Council ; European Research Council
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000705339100069
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/74546
Collection中国科学院国家天文台
Corresponding AuthorMazzi, Alessandro; Girardi, Leo
Affiliation1.Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy
2.Osservatorio Astron Padova INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy
3.Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo, Chile
4.SISSA, Via Bonomea 365, I-34136 Trieste, Italy
5.Anhui Univ, Hefei 230601, Peoples R China
6.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Dal Tio, Piero,Mazzi, Alessandro,Girardi, Leo,et al. Dissecting the Gaia HR diagram within 200 pc[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,506(4):5681-5697.
APA Dal Tio, Piero.,Mazzi, Alessandro.,Girardi, Leo.,Barbieri, Mauro.,Zaggia, Simone.,...&Marigo, Paola.(2021).Dissecting the Gaia HR diagram within 200 pc.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,506(4),5681-5697.
MLA Dal Tio, Piero,et al."Dissecting the Gaia HR diagram within 200 pc".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 506.4(2021):5681-5697.
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