Age-dating Red Giant Stars Associated with Galactic Disk and Halo Substructures

被引：32

作者：

Grunblatt, Samuel K. ^{[1
,2
]}

Zinn, Joel C. ^{[1
,3
]}

Price-Whelan, Adrian M. ^{[2
]}

Angus, Ruth ^{[1
,2
]}

Saunders, Nicholas ^{[4
]}

Hon, Marc ^{[4
]}

Stokholm, Amalie ^{[5
]}

Bellinger, Earl P. ^{[3
,5
]}

Martell, Sarah L. ^{[3
]}

Mosser, Benoit ^{[6
]}

Cunningham, Emily ^{[2
]}

Tayar, Jamie ^{[4
]}

Huber, Daniel ^{[4
]}

Rorsted, Jakob Lysgaard ^{[5
]}

Aguirre, Victor Silva ^{[5
]}

机构：

[1] Amer Museum Nat Hist, Dept Astrophys, 200 Cent Pk West, New York, NY 10024 USA

[2] Simons Fdn, Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA

[3] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[4] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[5] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[6] Univ Paris, Sorbonne Univ, Univ PSL, CNRS,LESIA,Observ Paris, F-92195 Meudon, France

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 916卷 / 02期

基金：

美国国家航空航天局; 新加坡国家研究基金会;

关键词：

STELLAR HALO; DATA RELEASE; GAIA DR2; SOLAR NEIGHBORHOOD; SCALING RELATION; MILKY; ASTEROSEISMOLOGY; OSCILLATIONS; POPULATIONS; ABUNDANCES;

D O I：

10.3847/1538-4357/ac0532

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The vast majority of Milky Way stellar halo stars were likely accreted from a small number (less than or similar to 3) of relatively large dwarf galaxy accretion events. However, the timing of these events is poorly constrained and predominantly relies on indirect dynamical mixing arguments or imprecise age measurements of stars associated with debris structures. Here, we aim to infer robust stellar ages for stars associated with galactic substructures to more directly constrain the merger history of the Galaxy. By combining kinematic, asteroseismic, and spectroscopic data where available, we infer stellar ages for a sample of 10 red giant stars that were kinematically selected to be within the stellar halo, a subset of which are associated with the Gaia-Enceladus-Sausage halo substructure, and compare their ages to 3 red giant stars in the Galactic disk. Despite systematic differences in both absolute and relative ages determined here, age rankings of stars in this sample are robust. Passing the same observable inputs to multiple stellar age determination packages, we measure a weighted average age for the Gaia-Enceladus-Sausage stars in our sample of 8 +/- 3 (stat.) +/- 1 (sys.) Gyr. We also determine hierarchical ages using isochrones for the populations of Gaia-Enceladus-Sausage, in situ halo and disk stars, finding a Gaia-Enceladus-Sausage population age of 8.0(-2.3)(+3.2) Gyr. Although we cannot distinguish hierarchical population ages of halo or disk structures with our limited data and sample of stars, this framework should allow a distinct characterization of Galactic substructures using larger stellar samples and additional data available in the near future.

引用

页数：19

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