Tuesday, May 25, 2010

- Blue GIANT-

Posted by Louisa at 10:10 AM


A Blue Giant is a star with a spectral type of O or B and thus being noticeably blue in appearance, and a they are so luminous.

A blue giant is a massive star that has exhausted the hydrogen fuel in its core and left the main sequence. Blue giants have a surface temperature of around 30 000 K and a luminosity some 10 000 times that of the Sun. As they grow older they expand and cool, eventually becoming red giants, or continuing fusion into a more luminous or massive star.

Most stars of this type are found in O-B associations, large collections of loosely bound young stars. Since they are so hot , their expected life is very short , and current theories predict that most of them will end their lives as supernovae.

Blue giant is a misused term, as giant usually implies an advanced evolutionary state in which the star fuses helium in its core, instead of hydrogen, as in like in the Red Giant. actually, they are middle-aged massive stars which are on the process of becoming massive bright giants .
for more info, please log on to:
-en.wikipedia.org/wiki/Blue_giant

 

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