Home > Astronomy, Galaxies, General Astronomy, Observatories & Facilities, Stars > Rare Ultra-Blue Stars Found in Andromeda’s Hub

Rare Ultra-Blue Stars Found in Andromeda’s Hub


Credit: NASA; ESA; B. Williams and J. Dalcanton, University of Washington, Seattle

Credit: NASA; ESA; B. Williams and J. Dalcanton, University of Washington, Seattle

Peering deep inside the hub of the neighboring Andromeda galaxy, NASA’s Hubble Space Telescope has uncovered a large, rare population of hot, bright stars.

Blue is typically an indicator of hot, young stars. In this case, however, the stellar oddities are aging, sun-like stars that have prematurely cast off their outer layers of material, exposing their extremely blue-hot cores.

Astronomers were surprised when they spotted these stars because physical models show that only an unusual type of old star can be as hot and as bright in ultraviolet light. 

While Hubble has spied these ultra-blue stars before in Andromeda, the new observation covers a much broader area, revealing that these stellar misfits are scattered throughout the galaxy’s bustling center. Astronomers used Hubble’s Wide Field Camera 3 to find roughly 8,000 of the ultra-blue stars in a stellar census made in ultraviolet light, which traces the glow of the hottest stars. The study is part of the multi-year Panchromatic Hubble Andromeda Treasury survey to map stellar populations across the galaxy.

Full Story: http://www.nasa.gov/mission_pages/hubble/science/ultra-blue.html

  1. No comments yet.
  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: