Asteroseismic modeling of RY Leporis gives a mass of ~2 solar masses and age of ~730 Myr, locating it in the post-main-sequence hydrogen shell-burning stage with consistent metallicity.
Period Changes of Delta Scuti Stars and Stellar Evolution
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abstract
Period changes of Delta Scuti stars have been collected or redetermined from the available observations and are compared with values computed from evolutionary models with and without convective core overshooting. For the radial pulsators of Pop. I, the observations indicate (1/P) dP/dt values around 10^-7 year^-1 with equal distribution between period increases and decreases. The evolutionary models, on the other hand, predict that the vast majority should show increasing periods. This increase should be a factor of about ten times smaller than observed. For nonradial Delta Scuti pulsators of Pop. I, the discrepancies are even larger. The behavior suggests that for these relatively unevolved stars the rate of evolution cannot be deduced from the period changes. The period changes of most Pop. II Delta Scuti (SX Phe) stars are characterized by sudden jumps of the order of Delta P/P approx. 10^-6. However, at least one star, BL Cam, shows a large, continuous period increase. The variety of observed behavior also seems to exclude an evolutionary origin of the changes. Model calculations show that the evolutionary period changes of pre-MS Delta Scuti stars are a factor of 10 to 100 larger than those of MS stars. Detailed studies of selected pre-MS Delta Scuti stars are suggested.
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Analysis of 120 δ Scuti stars from Kepler and K2 data identifies 32 candidates with sufficiently predictable light curves for potential spacecraft navigation, cross-checked against TESS observations.
citing papers explorer
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Asteroseismic analysis of RY Leporis: the post-main sequence HADS in a binary system
Asteroseismic modeling of RY Leporis gives a mass of ~2 solar masses and age of ~730 Myr, locating it in the post-main-sequence hydrogen shell-burning stage with consistent metallicity.
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Assessing the Predictability of $\delta$ Scuti Variable Stars for Spacecraft Navigation
Analysis of 120 δ Scuti stars from Kepler and K2 data identifies 32 candidates with sufficiently predictable light curves for potential spacecraft navigation, cross-checked against TESS observations.