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VSX Variability Types
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| SXPHE |
| Phenomenologically, these resemble HADS variables but they are pulsating
sub-dwarfs of the spherical component, or old disk galactic population, with spectral types in the range A2-F5. They may
show several simultaneous periods of oscillation, generally in the range 0.04-0.08 days,
with variable-amplitude light changes that may reach 0.7 mag. in V. These stars are present in globular clusters.
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