Assertion: asterism's star | /r/ObjectUse | used as standard candles
Facets:
Source sentences:
text: These stars are short period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.
text: Phi and Psi Pegasi are pulsating red giants, while Tau Pegasi (the proper name is Salm), is a Delta Scuti variable—a class of short period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.