Measuring Distance
Stellar Properties
H-R Diagram
Stellar Evolution
100
Name 3 ways to calculate the distance to a star. (Not counting triangulation)
Parallax, inverse square law, standard candles
100
___ magnitude measures brightness and ___ magnitude measures luminosity.
apparent; absolute
100
In the H-R Diagram, which star is a main sequence star that is reddish in color?
C
100
Match the stars' mass with its evolutionary outcome.
1. low-mass a. black hole
2. high-mass b. white dwarf
3. very high-mass c. neutron star
1. b
2. c
3. a
200
A star that is closer than 10 parsecs would have a (higher/lower/same) apparent magnitude than absolute magnitude.
higher
200
This property of a star determines its lifetime and evolutionary path.
Mass
200
The diagonal line on the H-R Diagram represents what type of stars?
Main sequence
200
The breakdown of the ____ in a __-mass star provides the conditions needed to cause a supernova and the outer layers to become (hotter/cooler).
hydrostatic equilibrium; high; cooler
300
Betelguese is 642.5 ly away and Sirius A is 8.6 ly away. Which star has the larger parallax?
Sirius A
300
Star A and Star B have the same luminosity but Star A is hotter than Star B. Therefore, we can infer that Star A's size is (greater than/less than/equal to) Star B.
less than
300
The H-R Diagram is set up with the ___ on the y-axis and ___ on the x-axis. Temperature increases to the ___ and luminosity increases to the ___.
Luminosity; temperature; left; up
300
DAILY DOUBLE
The CNO cycle and proton-proton chain processes mark the turning point of a ___ becoming a ____. As a giant star, helium fuses into carbon in the ___ process.
protostar; main sequence star; triple alpha
400
To obtain a parallax, we need to use Earth's orbit as a ___ and take measurements ____ apart.
baseline; six months
400
DOUBLE JEOPARDY
Sirius A is an A1V star, Rigel is a B8Iab star, and the Sun is a G2V star; all the stars are different colors. List the stars in order of surface temperature from highest to lowest along with their color.
Rigel-blue, Sirius A-white, Sun-yellow
400
Which star has the biggest size?
D
400
The dying point of a high-mass star is marked when ___ begins to fuse.
iron
500
According to the inverse square law, a star that is three times as far as another star will be how much brighter?
1/9 times as bright
500
Star A has narrower spectral lines than Star B. This means that Star A is (more/less/equally) dense than Star B and Star B is (more/less/equally) luminous than Star A.
less; less
500
The H-R Diagram confirms stellar evolutionary theories by plotting ____.
star clusters
500
___ drives stellar evolution and is finally opposed causing the star to stop contracting when a star reaches the ____ stage.
gravity; main sequence