The evolutionary state of UU Herculis stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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F Stars, Stellar Evolution, Stellar Temperature, Supergiant Stars, Asymptotic Giant Branch Stars, Hertzsprung-Russell Diagram, Stellar Color, Stellar Oscillations

Scientific paper

UU Her stars are often considered to be postasymptotic-giant-branch stars, which in turn implies that they should be in a state of rapid blueward evolution in the H-R diagram. A recent reviewer of theoretical models suggests an increase in effective temperature at the rate of 10 K to 40 K per year. Measurements of the (B-V) color indices of these stars over as much as 35 years, and the pulsational period of UU Her itself over 83 years are examined, and no evidence is found for detectable change in either of these quantities. This is found to constrain any rate of effective temperature change to less than 0.5 K per year and, therefore, it is concluded that most likely the UU Her stars are not post-AGB stars.

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