Download Apparent magnitude is the brightness of a star as it appears

Stars vary widely in their surface temperatures' The coolest stars
have surface temperatures aS low as 3,000oC, while the hottest
stars have surface temperatures ten times higher. The temperature
of a star determines its color-from cool, red stars to hot, blue
ones. The table below Shows how temperature and star color are
related. Recall that the sun is a medium-temperature yellow star'
Star Golor and TemPerature
Blue
30,000'c
White
9,500"c
Yellow
6,000'c
Orange
5,000'c
Red
3,000"c
The term magnitude is used to describe the brightness of a star'
Apparent magnitude is the brightness of a star as it appears
from Earth. This brightness depends partly on how far away the
star is. Absolute magnitude describes the actual brightness of
a star without considering its distance from the observer. The
absolute magnitude of stars is measured on a Scale from about
-15 to +15. On this scale, negative numbers correspond to
brighter stars.
Around 1910, Ejnar Hertzsprung and Daniel Russell independently
developed means for showing how a Star'S magnitude relates to
its surface temperature. Their findings were later combined into
a graph called the Hertzsprung-Russell (H-R) diagram. This
graph displays the relationship between a star's average Surface
temperature and its brightness.
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