Transcript Star Characteristics.ppsx

Topic: Star Characteristics
PSSA:
3.4.7.D/S8.D.3.1
Objective:
• TLW compare stars based on
their temperature,
composition, and brightness.
• TLW explain how a star’s
composition can be
determined using its spectrum.
MI #1: Temperature
• Scientists determine the
temperature of a star by its color.
• Stars that are red or orange are
cool. (Examples – Betelgeuse,
Antares, Arcturus)
• Stars that are hot are blue or
white. (Examples – Rigel, Vega,
Sirius)
MI #2: Composition
• Composition is the elemental
makeup of a star.
• Every element gives off a
unique set of emission lines in
its spectrum.
• By comparing emission lines,
scientists determine the
composition of a star.
MI #3: Brightness
• Apparent magnitude is the
brightness of a star as seen from
Earth.
• Absolute magnitude is the actual
brightness of a star.
• A star’s apparent magnitude and
distance from Earth can be used
to calculate its absolute
magnitude.
So What…? Real Life Application
• Understanding star
characteristics allows us to
compare stars and learn about
how stars change over time.