Precise Ages of Field Stars From White Dwarf Companions in Gaia DR2
| Autor: | Jia-Lu Nie, Hai-Jun Tian, Xi-Dong Wang, Morgan Fouesneau, Hans-Walter Rix, Ted von Hippel, Dan Qiu, Gao-Chao Liu |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Initial mass function Star (game theory) 05 social sciences Extinction (astronomy) 050301 education White dwarf FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Stars Photometry (astronomy) Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science 0103 physical sciences Binary star 010303 astronomy & astrophysics 0503 education Main sequence Solar and Stellar Astrophysics (astro-ph.SR) |
| DOI: | 10.48550/arxiv.2012.04890 |
| Popis: | We analyze 4\,050 wide binary star systems involving a white dwarf (WD) and usually a main sequence (MS) star, drawn from the large sample assembled by \citet[][hereafter, T20]{Tian_2020}. Using the modeling code BASE-9, we determine the system's ages, the WD progenitors' ZAMS masses, the extinction values ($A_V$), and the distance moduli. Discarding the cases with poor age convergences, we obtain ages for 3\,551 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 co-eval in a binary system, this provides precise age constraints on the usually low-mass MS companions, mostly inaccessible by any other means. Comment: 15 pages, 10 figures, 4 tables, accepted for publication in The Astrophysical Journal Supplement Series |
| Databáze: | OpenAIRE |
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