A variable star is, quite simply, a star that changes brightness. A star is considered variable if its apparent magnitude (brightness) is altered in any way from our perspective on Earth. These ...

The new results, from a team led by Grzegorz Pietrzyński (Universidad de Concepción, Chile, Obserwatorium Astronomiczne Uniwersytetu Warszawskiego, Poland), appear in the Nov. 25, 2010 edition of the ...

We have detected several candidates for Cepheid variables in eclipsing binary systems in the Large Magellanic Cloud 10 (LMC). Using high-resolution spectra, we confirmed the discovery of a classical ...

Since the 1960s, a class of special pulsating stars has stymied scientists attempting to weigh them. The two main ideas for how to measure these stars' masses have so far produced vastly different ...

In 1925, Edwin Hubble's observation of Cepheid variables in the Andromeda galaxy revolutionized astronomy, proving the existence of galaxies beyond the Milky Way. This discovery, aided by telescopes ...

We derived the distances for the five Cepheids from near-infrared photometry obtained with the Infrared Survey Facility (IRSF) and we used radial velocities from the Southern African Large Telescope ...

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

Stellar distances are primarily determined by the inverse-square law of light, which mathematically links a star's apparent brightness (m), intrinsic brightness (absolute magnitude, M), and distance ...

Cepheid variables are yellow super-giant stars that pulsate variably, changing in diameter and temperature. These shifts cause the stars to change brightness in a predictable manner. The strong ...