For 10 points, give this classification of a star that exhibits changing apparent brightness witnessed from Earth, as seen in the Cepheid type.
Altair and Denebola fall into the Delta Scuti class of these entities. Rotation with an ellipsoidal shape leads to this classification, and eclipsing binary stars such as Algol are also classified as this. One of this class of stars is the RR Lyrae type, which is among a class with period-luminosity relationship as determined by Henrietta Levitt that occupies the instability strip like many other stars of this type. For 10 points, give this classification of a star that exhibits changing apparent brightness witnessed from Earth, as seen in the Cepheid type.
Altair and Denebola fall into the Delta Scuti class of these entities.
{variable} star