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Sökning: onr:"swepub:oai:DiVA.org:su-201329" > The GALAH Survey :

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004256naa a2200685 4500
001oai:DiVA.org:su-201329
003SwePub
008220127s2022 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2013292 URI
0247 a https://doi.org/10.1093/mnras/stab33412 DOI
040 a (SwePub)su
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Sharma, Sanjib4 aut
2451 0a The GALAH Survey :b dependence of elemental abundances on age and metallicity for stars in the Galactic disc
264 c 2021-11-25
264 1b Oxford University Press (OUP),c 2022
338 a print2 rdacarrier
520 a Using data from the GALAH survey, we explore the dependence of elemental abundances on stellar age and metallicity among Galactic disc stars. We find that the abundance of most elements can be predicted from age and [Fe/H] with an intrinsic scatter of about 0.03 dex. We discuss the possible causes for the existence of the abundance–age–metallicity relations. Using a stochastic chemical enrichment scheme that takes the volume of supernovae remnants into account, we show the intrinsic scatter is expected to be small, about 0.05 dex or even smaller if there is additional mixing in the ISM. Elemental abundances show trends with both age and metallicity and the relationship is well described by a simple model in which the dependence of abundance ([X/Fe]) on age and [Fe/H] are additively separable. Elements can be grouped based on the direction of their abundance gradient in the (age,[Fe/H]) plane and different groups can be roughly associated with three distinct nucleosynthetic production sites, the exploding massive stars, the exploding white dwarfs, and the AGB stars. However, the abundances of some elements, like Co, La, and Li, show large scatter for a given age and metallicity, suggesting processes other than simple Galactic chemical evolution are at play. We also compare the abundance trends of main-sequence turn-off (MSTO) stars against that of giants, whose ages were estimated using asteroseismic information from the K2 mission. For most elements, the trends of MSTO stars are similar to that of giants. The existence of abundance relations implies that we can estimate the age and birth radius of disc stars, which is important for studying the dynamic and chemical evolution of the Galaxy.
650 7a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng
653 a Galaxy: disc
653 a Galaxy: evolution
653 a Galaxy: formation
653 a Galaxy:abundances
653 a Galaxy: kinematics and dynamics
7001 a Hayden, Michael R.4 aut
7001 a Bland-Hawthorn, Joss4 aut
7001 a Stello, Dennis4 aut
7001 a Buder, Sven4 aut
7001 a Zinn, Joel C.4 aut
7001 a Spina, Lorenzo4 aut
7001 a Kallinger, Thomas4 aut
7001 a Asplund, Martin4 aut
7001 a De Silva, Gayandhi M.4 aut
7001 a D'Orazi, Valentina4 aut
7001 a Freeman, Ken C.4 aut
7001 a Kos, Janez4 aut
7001 a Lewis, Geraint F.4 aut
7001 a Lin, Jane4 aut
7001 a Lind, Karinu Stockholms universitet,Institutionen för astronomi4 aut0 (Swepub:su)kali3212
7001 a Martell, Sarah L.4 aut
7001 a Schlesinger, Katharine J.4 aut
7001 a Simpson, Jeffrey D.4 aut
7001 a Zucker, Daniel B.4 aut
7001 a Zwitter, Tomaž4 aut
7001 a Chen, Boquan4 aut
7001 a Cotar, Klemen4 aut
7001 a Kafle, Prajwal R.4 aut
7001 a Khanna, Shourya4 aut
7001 a Tepper-Garcia, Thor4 aut
7001 a Wang, Purmortal4 aut
7001 a Wittenmyer, Rob A.4 aut
7102 a Stockholms universitetb Institutionen för astronomi4 org
7730 t Monthly notices of the Royal Astronomical Societyd : Oxford University Press (OUP)g 510:1, s. 734-752q 510:1<734-752x 0035-8711x 1365-2966
8564 u http://arxiv.org/pdf/2011.13818
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-201329
8564 8u https://doi.org/10.1093/mnras/stab3341

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