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- W2901229743 abstract "Radius inflation continues to be explored as a peculiar occurrence among magnetically active, low-mass stars. Recently Somers et. al. 2017 showed that radius inflation among low-mass stars in the young open cluster M45 (Pleiades Cluster) is correlated to the rotation rate: faster rotators are more inflated. Here we extend that work to a sample of 68 stars of the older open Hyades Cluster. We derive the stars' spectral energy distributions to measure their bolometric fluxes. With spectroscopically defined $T_{rm eff}$ and {it Gaia/} distances we calculate stellar radii using the Stefan-Boltzmann relation. We find numerous stars that exhibit significant (3-4$sigma$) radius inflation relative to a nominal cluster isochrone. We compare these results to that of the younger Pleiades and consider radius inflation as a function of open cluster evolution. We find that unlike the Pleiades, there is not a statistically significant correlation between radius inflation and stellar rotation period. However, we do find that most inflated stars have (rapid) rotational Rossby numbers of 0.1--0.2, such that the correlation of radius inflation with Rossby number is statistically significant at 99.98% confidence. Since the canonical rotation-activity relation of low-mass stars is understood to result from the connection between magnetic activity and surface convection, our results imply that magnetic activity within the convective layers of low-mass stars is what preferentially drives radius inflation" @default.
- W2901229743 created "2018-11-29" @default.
- W2901229743 creator A5056069837 @default.
- W2901229743 creator A5064383112 @default.
- W2901229743 creator A5088359901 @default.
- W2901229743 date "2019-07-02" @default.
- W2901229743 modified "2023-10-18" @default.
- W2901229743 title "Radius Inflation at Low Rossby Number in the Hyades Cluster" @default.
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- W2901229743 doi "https://doi.org/10.3847/1538-4357/ab21cf" @default.
- W2901229743 hasPublicationYear "2019" @default.
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