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dc.contributor.authorGe, Z. S.
dc.contributor.authorBi, S. L.
dc.contributor.authorChen, Y. Q.
dc.contributor.authorLi, T. D.
dc.contributor.authorZhao, J. K.
dc.contributor.authorLiu, K.
dc.contributor.authorFerguson, Jason W.
dc.contributor.authorWu, Y. Q.
dc.date.accessioned2017-02-06T00:20:57Z
dc.date.available2017-02-06T00:20:57Z
dc.date.issued2016-12-15
dc.identifier.citationGe, Z. S.; Bi, S. L.; Chen, Y. Q.; Li, T. D.; Zhao, J. K.; Liu, K.; Fergusion, Jason W.; Wu, Y. Q. 2016. Ages of 70 dwarfs of three populations in the solar neighborhood: considering O and C abundances in stellar models. Astrophysical Journal, vol. 833:no. 2en_US
dc.identifier.issn0004-637X
dc.identifier.otherWOS:000391169600036
dc.identifier.urihttp://dx.doi.org/10.3847/1538-4357/833/2/161
dc.identifier.urihttp://hdl.handle.net/10057/12846
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractOxygen and carbon are important elements in stellar populations. Their behavior refers to the formation history of the stellar populations. C and O abundances would also obviously influence stellar opacities and the overall metal abundance Z. With observed high-quality spectroscopic properties, we construct stellar models with C and O elements to give more accurate ages for 70 metal-poor dwarfs, which have been determined to be high-a halo, low-alpha halo, and thick-disk stars. Our results show that high-alpha halo stars are somewhat older than low-alpha halo stars by around 2.0 Gyr. The thick-disk population has an age range in between the two halo populations. The age distribution profiles indicate that high-alpha halo and low-alpha halo stars match the in situ accretion simulation by Zolotov et al., and the thick-disk stars might be formed in a relatively quiescent and long-lasting process. We also note that stellar ages are very sensitive to O abundance, since the ages clearly increase with increasing [O/Fe] values. Additionally, we obtain several stars with peculiar ages, including 2 young thick-disk stars and 12 stars older than the universe age.en_US
dc.description.sponsorshipThis work is supported by grants 11273007 and 10933002 from the National Natural Science Foundation of China, the Joint Research Fund in Astronomy (U1631236) under cooperative agreement between the National Natural Science Foundation of China (NSFC) and Chinese Academy of Sciences (CAS), and the Fundamental Research Funds for the Central Universities. This work is also supported by the Youth Scholars Program of Beijing Normal University.en_US
dc.language.isoen_USen_US
dc.publisherIOP Publishing Ltden_US
dc.relation.ispartofseriesAstrophysical Journal;v.833:no.2
dc.subjectGalaxy: disken_US
dc.subjectGalaxy: formationen_US
dc.subjectGalaxy: haloen_US
dc.subjectStars: abundancesen_US
dc.subjectStars: fundamental parametersen_US
dc.titleAges of 70 dwarfs of three populations in the solar neighborhood: considering O and C abundances in stellar modelsen_US
dc.typeArticleen_US
dc.rights.holder© 2016. The American Astronomical Society. All rights reserved.en_US


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