Stars
Astronomy with Vander Vorst at Litchfield Senior High School
About this deck
By: LHS MOSH
Created: 2012-01-30
Size: 35 flashcards
Views: 2
Created: 2012-01-30
Size: 35 flashcards
Views: 2
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What is magnitude?
measure of how bright a star appears
What is absolute magnitude?
apparent magnitude of a star if it were placed 32.6 LY away
Who first cataloged the stars at night according to magnitude?
Greek astronomer Hipparchus
What does the color of a star tell us?
temperature
Describe the temperature scale
Blue is the hottest
Red is the coolest
Blue(hot) White Yellow Orange Red(cool)
Red is the coolest
Blue(hot) White Yellow Orange Red(cool)
What is the color index measure?
apparent magnitudes in blue and visible (light)
I R O Y G B I V
infrared ultraviolet
I R O Y G B I V
infrared ultraviolet
What does the H-R Diagram?
plots luminosity vs. spectral class (temperature)
developed in 1913 by Henry Harris Russell and Ejnar Hertzsprung
developed in 1913 by Henry Harris Russell and Ejnar Hertzsprung
What does mass determine?
how fast fusion runs
What do stars form from?
clouds of dust/gas
What does a star's mass at birth determine?
lifetime characteristics
What are the H-R extremes?
Blue, super hot stars
go in extreme upper left
1,000,000 L sun (1 million times the luminosity of the sun)
go in extreme upper left
1,000,000 L sun (1 million times the luminosity of the sun)
What is 1 AU?
It equals 93 million miles (distance from earth to the sun)
What class are cool super giants?
K, M class
-10,000 L sun
-10,000 L sun
What are the Spectral Classes?
O Blue/Violet
B White
A White
F White
G Yellow
K Orange
M Red
B White
A White
F White
G Yellow
K Orange
M Red
How do we remember the order of the spectral classes?
Oh
Be
A
Fine
Guy/Girl
Kiss
Me
Be
A
Fine
Guy/Girl
Kiss
Me
What spectral class is our sun?
G2
What three elements did the universe start with?
hydrogen
helium
lithium
helium
lithium
What is the principle of equivalence?
The absence of gravity is the same as free-fall.
Where are most stars located on the H-R diagram?
main sequence
What theory did Albert Einstein come up with?
theory of relativity
What is gravitational redshift?
As electromagnetic waves increase in wavelength, time runs slower.
What does the theory of relativity state in relation to black holes?
In a black hole, spacetime is so curved, light cannot escape.
What is one myth about black holes?
everything gets sucked in
You can still orbit.
You don't go past the event horizon.
You can still orbit.
You don't go past the event horizon.
What is the point on a black hole when the escape velocity is too great?
event horizon
What do black holes form from?
stellar cores greater than 3M sun (three times the mass of our sun)
massive stars
massive stars
As a star dies and helium runs out and the core collapses, what is left?
carbon and oxygen
What three things can be determined by placement on a H-R diagram?
luminosity
temperature
mass
temperature
mass
Why do some stars appear brighter to us than others?
closer to us
bigger than the other stars
bigger than the other stars
By what factor does each magnitude of star differ from the next?
2.512
Name some different types of galaxies
spiral
lenticular
elliptical
irregular
lenticular
elliptical
irregular
Where are stars born?
nebula
How old is the universe?
15-20 billion years old
How old are the oldest star clusters?
12-15 billion years old
When were the earth and sun formed?
about 4.5 billion years ago
About this deck
By: LHS MOSH
Created: 2012-01-30
Size: 35 flashcards
Views: 2
Created: 2012-01-30
Size: 35 flashcards
Views: 2
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy
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