Such stars, called Cepheids, are considered " standard candles " whose varying luminosity gives a gauge for their distance.
22.
"I happen to think that these are the best standard candles we've ever had, " said Turner of Chicago.
23.
Used as a standard candle, these objects have consistently given Sandage and his collaborators Hubble Constants of about 50.
24.
Its outer arms have a high number of Cepheid variables, which are used as standard candles to determine astronomical distances.
25.
Controlling and calibration systematic effects are important for type Ia supernovae to be used as standard candles for cosmological analysis.
26.
Some of the best standard candles are those in a class of stars called Cepheids, which pulsate with clockwork regularity.
27.
Thus, if their light is carefully analyzed, these explosions should make ideal " standard candles " for measuring cosmic distances.
28.
For distant supernovae of known luminosity, called standard candles, in other galaxies allows the inference of the distance to the host galaxy.
29.
For his work with students using supernova light curves as calibrated standard candles, providing evidence for an accelerating expansion of the universe.
30.
It gives its name to a group of stars known as SX Phoenicis variables . standard candles and as subjects to study astroseismology.
