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

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 parall...

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Bibliographic Details
Published in:The Astrophysical journal 2024-12, Vol.977 (1), p.15
Main Authors: Chiti, Federica, van Saders, Jennifer L., Heintz, Tyler M., Hermes, J. J., Ong, J. M. Joel, Hey, Daniel R., Ramirez-Weinhouse, Michele M., Dugas, Alison
Format: Article
Language:English
Subjects:
Angular momentum
Atmospheric models
Binary stars
Braking
Chronology
Initial conditions
Low mass stars
Momentum transport
Open clusters
Rotation
Sky surveys (astronomy)
Stars
Stellar activity
Stellar age
Stellar ages
Stellar evolution
Stellar magnetic fields
Stellar rotation
Structural stability
White dwarf stars
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Summary: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
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad856c