A New Asteroseismic Kepler Benchmark Constrains the Onset of Weakened Magnetic Braking in Mature Sun-Like Stars
arxiv(2024)
摘要
Stellar spin down is a critical yet poorly understood component of stellar
evolution. In particular, results from the Kepler Mission imply that mature
age, solar-type stars have inefficient magnetic braking, resulting in a stalled
spin down rate. However, a large number of precise asteroseismic ages are
needed for mature (≥ 3Gyr) stars in order to probe the regime where
traditional and stalled spin-down models differ. In this paper, we present a
new asteroseismic benchmark star for gyrochronology discovered using
reprocessed Kepler short cadence data. KIC 11029516 (Papayu) is a bright
(K_p = 9.6 mag) solar-type star with well-measured rotation period
(21.1±0.8 days) from spot modulation using 4 years of Kepler long cadence
data. We combine asteroseismology and spectroscopy to obtain
T_eff=5888±100 K, [Fe/H] = 0.30 ± 0.06 dex, M = 1.24 ± 0.05
M_⊙, R = 1.34 ± 0.02 R_⊙ and age of 4.0 ± 0.4 Gyr, making
Papayu one of the most similar stars to the Sun in terms of temperature and
radius with an asteroseismic age and a rotation period measured from spot
modulation. We find that Papayu sits at the transition of where traditional and
weakened spin-down models diverge. A comparison with stars of similar zero-age
main-sequence temperatures supports previous findings that weakened spin-down
models are required to explain the ages and rotation periods of old solar-type
stars.
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