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Starsgo

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by

Richard Nocillado

on 2 December 2014

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Transcript of Starsgo

CHARACTERISTICS OF STARS
Mass
Size
Temperature
Color
Brightness
MASS
each star is born with a specific mass
the mass is the main factor in determining the star's brightness, temperature, expected lifetime, type of death and spectra
more massive the star is, the greater the gravity, the hotter and denser a star must be
SIZE of a STAR
the diameter of stars range from as little as 1/10 the sun's diameter to hundred of times larger
our sun is a medium sized star
TEMPERATURE
stars range in temperature from 2000K to 5000K
different color of stars gives different temperatures
our sun is a yellow star having a surface temperature of about 5500K
COLOR of the STARS
star color ranges from red to yellow to blue depending on the temperature of the star
red stars are cooler stars
blue stars are hottest stars
STARS
a ball of plasma that emits light throughout the universe held together by its own gravity
reactions occur in stars H --> He
distance of a star from Earth is measured in light years
STAR, STARRY NIGHT
Light-Years
the distance which a ray of light would travel in one year
about 6,000,000,000,000 miles
186,000 miles per second
BRIGHTNESS
described in terms of magnitude and luminosity
MAGNITUDE
measure of brightness of celestial objects
APPARENT MAGNITUDE
Brightness of the star depends on its size and distance from the Earth
Hipparchus devised a scale of 1 to 6 to describe the apparent magnitude
smaller values represent brighter objects than larger values
Ex. brightest stars were classified as first magnitude stars or magnitude 1 and the faintest are sixth magnitude stars or magnitude 6
LUMINOSITY
Absolute magnitude or true brightness
describes the rate at which star radiates energy or the amount of light it radiates
size of star and its surface temperature affect the luminosity
Sun's luminosity is 400 trillion watss which is used as the refererence value for describing luminosity of other stras
STELLAR CLASSIFICATION
astronomers place stars in spectral (color) class categories based on their surface temperature
decreasing temperature
Full transcript