Precise Ages of Field Stars from White Dwarf Companions in Gaia DR2

被引：13

作者：

Qiu, Dan ^{[1
,2
]}

Tian, Hai-Jun ^{[1
,2
]}

Wang, Xi-Dong ^{[1
]}

Nie, Jia-Lu ^{[3
]}

Hippel, Ted von ^{[4
]}

Liu, Gao-Chao ^{[1
,2
]}

Fouesneau, Morgan ^{[5
]}

Rix, Hans-Walter ^{[5
]}

机构：

[1] China Three Gorges Univ, Yichang 443002, Peoples R China

[2] China Three Gorges Univ, Ctr Astron & Space Sci, Yichang 443002, Peoples R China

[3] Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China

[4] Embry Riddle Aeronaut Univ, Phys Sci Dept, Daytona Beach, FL 32114 USA

[5] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2021年 / 253卷 / 02期

基金：

欧洲研究理事会; 美国国家科学基金会; 中国国家自然科学基金;

关键词：

Stellar ages; Wide binary stars; Field stars; Markov chain Monte Carlo; Bayesian statistics; Main sequence stars; White dwarf stars; Zero-age main sequence stars; Stellar evolutionary tracks; Initial mass function; Photometry; FINAL MASS RELATIONSHIP; METALLICITY RELATION; STELLAR POPULATIONS; GALACTIC-DISK; HYDROGEN-RICH; EVOLUTION; EXTINCTION; ISOCHRONES; PARAMETERS; EMISSION;

D O I：

10.3847/1538-4365/abe468

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze 4050 wide binary star systems involving a white dwarf (WD) and usually a main-sequence (MS) star, drawn from the large sample assembled by Tian et al. Using the modeling code BASE-9, we determine the system's ages, the WD progenitors' zero-age MS masses, the extinction values (A(V)), and the distance moduli. Discarding the cases with poor age convergences, we obtain ages for 3551 WDs, with a median age precision of sigma(tau)/tau = 20%, and system ages typically in the range of 1-6 Gyr. We validated these ages against the very few known clusters and through cross validation of 236 WD-WD binaries. Under the assumption that the components are coeval in a binary system, this provides precise age constraints on the usually low-mass MS companions, mostly inaccessible by any other means.

引用

页数：11

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