TESS data show stochastic low-frequency variability dominates in most extreme helium stars, with characteristic timescales of 0.5-10 days correlating to stellar parameters and matching subsurface convection predictions.
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Simulations overpredict hot subdwarf and RR Lyrae binaries with Gaia astrometric solutions but match red clump stars with high mass functions as potential black hole impostors, implying fewer au-scale RR Lyrae binaries than expected.
citing papers explorer
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TESS Observations of Stochastic Low-frequency Variability in Extreme Helium Stars
TESS data show stochastic low-frequency variability dominates in most extreme helium stars, with characteristic timescales of 0.5-10 days correlating to stellar parameters and matching subsurface convection predictions.
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Testing models for fully and partially stripped low-mass stars with Gaia: Implications for hot subdwarfs, binary RR Lyrae, and black hole impostors
Simulations overpredict hot subdwarf and RR Lyrae binaries with Gaia astrometric solutions but match red clump stars with high mass functions as potential black hole impostors, implying fewer au-scale RR Lyrae binaries than expected.