Rotation at the Fully Convective Boundary: Insights from Wide WD + MS Binary Systems

Autor: Federica Chiti, Jennifer L. van Saders, Tyler M. Heintz, J. J. Hermes, J. M. Joel Ong, Daniel R. Hey, Michele M. Ramirez-Weinhouse, Alison Dugas
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: The Astrophysical Journal, Vol 977, Iss 1, p 15 (2024)
Druh dokumentu: article
ISSN: 1538-4357
DOI: 10.3847/1538-4357/ad856c
Popis: Gyrochronology, a valuable tool for determining ages of low-mass stars where other techniques fail, relies on accurate calibration. We present a sample of 185 wide (>100 au) white dwarf + main sequence (WD + MS) binaries. Total ages of WDs are computed using all-sky survey photometry, Gaia parallaxes, and WD atmosphere models. Using a magnetic braking law calibrated against open clusters, along with assumptions about initial conditions and angular momentum transport, we construct gyrochrones to predict the rotation periods of MS stars. Both data and models show that, at the fully convective boundary (FCB), MS stars with WD ages of up to 7.5 Gyr and within a
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