Help Identifying Variable Type

American Association of Variable Star Observers (AAVSO)
Sat, 06/27/2020 - 16:46

I am new to SPP and would appreciate help identifying a variable type.

HIP105217 is an 8.7 mag A9V star with the attached light curve.  The amplitude of variation (half full range) is 0.022 mag TESS.  A DCDFT analysis with VStar indicates two very dominate periods - 0.6150 and 0.5746 days.  With a bit of analysis (not shown) it seems to me that the light curve is very consistent with two sinusoidal waves with these periods alternately reinforcing and damping each other.

This very much sounds to me like a delta scuti variable.  However, the periods seem twice as long as the description of this type I find in Percy's book.

I would welcome some advice,


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American Association of Variable Star Observers (AAVSO)
GDOR star

Hi Cliff,

These values for the periods (and the fact that the object is multiperiodic) point to a GDOR classification.
A9 is in the hot side of the GDOR instability strip and the cool side of the DSCT instability strip. Actually there are many objects around these spectral types that show both types of pulsations and that's why they are called hybrids.
So this is a GDOR variable.