Unit 7 Flashcards
_____________ occurs in really hot stars.
triple-alpha process
In which luminosity class are main-sequence stars chosen?
Class V
An object being compressed to infinite density to almost no volume is a point called ________.
singularity
Helium-4 is created after the ___________.
hydrogen-helium process
Which type of star is the sun since it is above-average size?
G2
_____ marks the end of a blue star’s life.
iron
_____ spin rapidly because they are governed by the spin rate of their original star because of how small it has become.
Pulsars
The spectroscope was invented by _______________.
Joseph von Fraunhofer
_____________ plotted the absolute magnitude of stars against their spectral classes.
Henry Russell
plotted the absolute magnitude of individual stars within clusters against their colors
Enjar Herzsprung
When the absolute magnitude of stars against their __________, that chart is called the ______________.
temperatures, H-R Diagram
________ begins and ends with the same element.
carbon-cycle
The measurement of the total energy output of a star is called
__________.
absolute magnitude
Fluids at rest are called _____________.
hydrostatic equilibrium
Because their electrons cannot get any closer, __________ do not get any smaller.
white dwarfs
___________ indicated by adding a Roman numeral to the letter and number that designates a star’s class
luminosity
Everything we know about stars is because of the _____ they emit.
light
Which term refers to how bright a star looks in the sky?
apparent magnitude
_____ rules what characteristics a star shows through all stages of its activity.
Mass
What star suddenly flares up, then grows dim over time?
nova
In the triple-alpha process, when helium begins to fuse _______ it is called a ____________.
carbon, helium flash
A star that explodes, neutron stars and black holes are forms of ________________.
degenerate matter
To keep helium from collecting within their cores, ______ used convection.
red dwarfs
A ______ leaves the main sequence when it stops fusing _______ into helium in its core.
star, hydrogen
Stars toward the lower right of the _______________ fuse elements at a slower rate because they have less internal ______________.
main sequence, nuclear activity
