What type of stars have longer periods 2 to 60 days?

What type of stars have longer periods 2 to 60 days?

Cepheid stars and RR Lyrae star are examples of pulsating variable stars. The greater the luminosity of a Cepheid star, the longer its period of oscillation.

What is so special about Cepheids?

Cepheids, also called Cepheid Variables, are stars which brigthen and dim periodically. This behavior allows them to be used as cosmic yardsticks out to distances of a few tens of millions of light-years. a uniform function of their brightness.

Why do Cepheids pulsate?

Pulsating variable stars are intrinsic variables as their variation in brightness is due to a physical change within the star. In the case of pulsating variables this is due to the periodic expansion and contraction of the surface layers of the stars.

Why did she need to use stars in another galaxy and not Cepheids located in the Milky Way?

Why did she need to use stars in another galaxy and not cepheids located in the Milky Way? She studied the Cepheid stars in the Magellanic Clouds and observed that the Cepheids with longer periods were brighter than those with shorter periods.

Where are many of the older metal poor stars found in the Milky Way galaxy?

Old, metal-poor stars exist in the outer halo of our galaxy. These are the earliest formed stars in our galaxy. Infrared image of a spiral galaxy (NGC 7331) photographed by NASA’s Spitzer Space Telescope. Scientists believe this galaxy looks like our own with swirling arms and a central bulge.

What are two sections of space that are next to the Milky Way galaxy?

The Andromeda galaxy and our Milky Way galaxy reign as the two most massive and dominant galaxies within the Local Group of Galaxies. The Andromeda Galaxy is the largest galaxy of the Local Group, which, in addition to the Milky Way, also contains the Triangulum Galaxy and about 30 other smaller galaxies.

What is the relationship between brightness luminosity and distance?

Brightness-Luminosity Relationship: At a particular Luminosity, the more distant an object is, the fainter its apparent brightness becomes as the square of the distance.