stars
DESCRIPTION
This slide show on the stars gives a basic introduction at the high school level.TRANSCRIPT
StarsStars
TemperatureTemperature Hot = blue star
(about 30,000o) Cool = red star
(about 2500o) Sun = yellow star
(about 6000o)
Hot = blue star (about 30,000o)
Cool = red star (about 2500o)
Sun = yellow star (about 6000o)
Constellation Orion Constellation Orion
BrightnessBrightness
Apparent Magnitude (m)
- The brightness of a star from a specific location
Absolute Magnitude (M)
- The brightness of a star from 10 parsecs away (32.6 light-years)
Apparent Magnitude (m)
- The brightness of a star from a specific location
Absolute Magnitude (M)
- The brightness of a star from 10 parsecs away (32.6 light-years)
BrightnessBrightness
The lower the number the brighter the star
Example: -1 is brighter than 5
The lower the number the brighter the star
Example: -1 is brighter than 5
Big DipperBig Dipper
Stellar EvolutionStellar EvolutionNebula - a
cloud of dust and gases - the birthplace of stars -”molecular cloud”
Nebula - a cloud of dust and gases - the birthplace of stars -”molecular cloud”
Eagle NebulaEagle Nebula
Stellar EvolutionStellar Evolution
Protostar - • before a real star
• temperature increasing
Protostar - • before a real star
• temperature increasing
Stellar EvolutionStellar Evolution
Main Sequence Star - fusion has begun in the core; average size & temp.; H fuses to HE
Main Sequence Star - fusion has begun in the core; average size & temp.; H fuses to HE
SunSun
Stellar EvolutionStellar EvolutionGiant or Super-giant -
all H has been fused - now fusing Helium - star begins to expand & cool
Giant or Super-giant -
all H has been fused - now fusing Helium - star begins to expand & cool
From a GiantFrom a Giant
Planetary NebulaAll Helium goneOuter gases of
star drift awayRemaining gases
collapse forming next stage
Planetary NebulaAll Helium goneOuter gases of
star drift awayRemaining gases
collapse forming next stage
…from a Planetary Nebula
…from a Planetary Nebula
White Dwarf - shrinking star
…then…*(smallest stars )
Black Dwarf - fades away
OR
*(larger small stars) Nova - explosion
White Dwarf - shrinking star
…then…*(smallest stars )
Black Dwarf - fades away
OR
*(larger small stars) Nova - explosion
…from a Supergiant…from a Supergiant
Supernova - collapse & violent explosion
Supernova - collapse & violent explosion
…from a Supernova …from a Supernova
*(smaller large stars) Neutron Star - extremely
small, dense rotating starOR
*(largest stars)Black Hole - so dense even
light can not escape
*(smaller large stars) Neutron Star - extremely
small, dense rotating starOR
*(largest stars)Black Hole - so dense even
light can not escape
All visuals are from :All visuals are from :
“Astronomy Picture of the Day” from NASA found at:
http://antwrp.gsfc.nasa.gov/apod/
“Astronomy Picture of the Day” from NASA found at:
http://antwrp.gsfc.nasa.gov/apod/