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VSX Variability Types
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| DSCT |
| Variables of the δ Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying
light amplitudes from 0.003 to 0.9 mag. in V (those with amplitudes larger than 0.15 mag. and assymetric light curves are
designated HADS) and periods from 0.01 to 0.2 days. The shapes of the light
curves, periods, and amplitudes usually vary greatly. Radial as well as non-radial pulsations are observed.
The variability of
some members of this type appears sporadically and sometimes completely ceases, this being a consequence
of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001
mag. in some cases. The maximum of the surface layer expansion does not lag behind the maximum
light for more than 0.1 periods. DSCT stars are representatives of the
galactic disk (flat component), SXPHE stars are halo objects.
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