RR Lyrae, an old yellow giant star 850 light-years distant in northwest Lyra, near the border of Cygnus, is the prototype of one of the most important classes of pulsating variable stars. RR ...

Using high-resolution spectra obtained with the MIKE spectrograph at the 6.5-m Magellan Clay telescope at the Las Campanas Observatory in Chile, and the UVES spectrograph attached to the 8.2-m VLT ...

Astronomers have discovered more than 200 distant variable stars known as RR Lyrae stars in the Milky Way’s stellar halo. The most distant of these stars is more than a million light years from Earth, ...

A team led by Andrea Kunder from the Leibniz Institute for Astrophysics Potsdam (AIP) measured the velocity of a sample of 100 old RR Lyrae stars* thought to reside in the galactic bulge, the central ...

Earth is fortunate to be orbiting a star that is fairly constant in its light production. The amount of light energy reaching Earth from the Sun has varied by much less than 1 percent over the past ...

A new study under the SPECTRUM project updated radiative opacity tables in hydrodynamical pulsation models for Classical Cepheid and RR Lyrae stars. The results show only minor shifts in instability ...