We will achieve this improvement by analyzing 9 unique Cepheids
in eclipsing binaries in the LMC our group has discovered which allow factor- of-ten improvements in the determination of all basic physical parameters of Cepheids
To understand how the galaxy was formed and how it evolved over time, analyzing the distribution of stars is important and the Cepheids
prove to be helpful in this.
Pulsating stars called Cepheids
are ideal for this.
These stars are much less luminous than the better-behaved Cepheids
that astronomers use as intergalactic distance gauges.
Some specific topics explored include the supermassive black hole in the Milky Way, optical to near-infrared light curves of classical Cepheids
, young stellar objects in the large Magellanic cloud, dwarf Cepheids
in the Carina Dwarf Spheroidal Galaxy, and helium in the Galactic bulge.
Astronomers use Cepheids
as distance markers because the brighter the star, the slower it pulsates.
The technique worked so well that additional Hubble distance measurements to other far-flung Cepheids
are being measured.
are bright but, beyond 100,000,000 light-years from Earth, their signal gets lost among other bright stars.
Freedman and colleagues will begin their 700 hours of observations refining the distance to the LMC using Cepheids
newly calibrated based on new Spitzer observations of similar stars in our own Milky Way.
If you can measure the distance to nearby Cepheids
in our own galaxy, and you compare them to Cepheids
in other galaxies, you can find out how far away the other galaxies are.
are from population I, they are sometimes called Type I Cepheids
Light curves of 135 classical Cepheids
observed by Hipparcos were decomposed.