fusion
The sun became a star when _____ occured
granulation
Convection is seen on the Sun as _____
hydrogen
_____ is the most abudant element in the Sun
11 years
The sunspot cycle lasts _____
photosphere
The region of the Sun that we see is called the _____
x-ray
The Sun's corona emits most of itsnenergy at _____ wavelengths
sunspots
The Sun's magnetic field is associated with _____
M
The coolest stars have a spectral type of _____
O
The hottest stars have a spectral type of _____
helium
Hydrogen burning produces _____
stellar cores
The most abundant heavy elements form in _____
parallax
_____ is used to determine distances nearby stars
mass
what property of stars is best learned from binary systems?
size and temperature
luminosity depends on _____
parsecs
distances between stars are measued in _____
upper right
In what part of the H-R Diagram do red giants lie?
distance
the ratio of luminosity to flux gives ______
bluest
the most massive stars are the _____
white dwarfs
low mass stars end their lives as _____
degenerate electron pressure
_____ supports white dwarfs against gravity
saftey value
degenreate pressure has no _____
old & most luminous are red
which properties apply to stars in globular clusters?
interstellar
stars are forming in _____ today
a city
which is the closest to the radius of a neutron star
flash
for low mass stars, helium burning starts with a _____
heat
the energy source for a protostar is _____
main sequence
The Sun is a _____ star
low mass
_____ stars live the longest
helium
red giants burn _____ in their cores