PSU ASTRO 7N EXAM LATEST
2
On the Hertsprung-Russell diagram cooler stars are ____ and hotter stars
are_____ - ANSWERS-redder;bluer
Stars effective surface temperature is estimated using its - ANSWERS-
spectral class
7 major spectral classes of stars from hotter to cooler - ANSWERS-O-B-
A-F-G-K-M
( Oh, Be A Fine Girl, Kiss Me)
Closest star to earth - ANSWERS-Alpha Centauri
The brightest star in the night sky - ANSWERS-Sirius( the "Dog Star")
it is twice as massive as the Sun, it is a white dwarf
properties of a star - ANSWERS-luminosity, mass, size, temperature,
and age
luminosities of main sequence stars - ANSWERS-range from 10^-3 to
10^6 times that of the sun
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, PSU ASTRO 7N EXAM LATEST
2
for stars on main sequence, higher temperature stars have - ANSWERS-
higher luminosity
Stars Not on the Main Sequence - ANSWERS-red giants and
supergiants, and white dwarfs
red giants and supergiants - ANSWERS-burning helium not hydrogen
anymore; starting to die; size is large, so they are luminous even though
they are relatively cool
white dwarfs - ANSWERS-hot, small, and dim
planetary nebula - ANSWERS-is the ejected envelope(the layers outside
the core) of a low to intermediate mass star
the end state of a former star's core is - ANSWERS-a white dwarf
Sun's history - ANSWERS-stellar nursery, protostar, main sequence, red
giant, planetary nebula, white dwarf
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2
, PSU ASTRO 7N EXAM LATEST
2
"type II" supernova - ANSWERS-a violent explosion with the star's core
left behind; the explosion itself creates a short-lived highly-energetic
environment
if the cores mass is > than 3 solar masses it becomes a - ANSWERS-
black hole
if the core is about 1.4-3 solar masses it becomes a - ANSWERS-
neutron star
The sun is composed mostly of - ANSWERS-gas- 73% hydrogen and
25% helium
Diameter and mass of sun - ANSWERS-diameter: 109x the earth
mass: 333,000x the earth
Luminosity is equal to - ANSWERS-4x10^24 100 Watt light bulbs
99.9% of all the mass of the solar system is ___ - ANSWERS-in the sun
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3
2
On the Hertsprung-Russell diagram cooler stars are ____ and hotter stars
are_____ - ANSWERS-redder;bluer
Stars effective surface temperature is estimated using its - ANSWERS-
spectral class
7 major spectral classes of stars from hotter to cooler - ANSWERS-O-B-
A-F-G-K-M
( Oh, Be A Fine Girl, Kiss Me)
Closest star to earth - ANSWERS-Alpha Centauri
The brightest star in the night sky - ANSWERS-Sirius( the "Dog Star")
it is twice as massive as the Sun, it is a white dwarf
properties of a star - ANSWERS-luminosity, mass, size, temperature,
and age
luminosities of main sequence stars - ANSWERS-range from 10^-3 to
10^6 times that of the sun
END OF
PAGE
1
, PSU ASTRO 7N EXAM LATEST
2
for stars on main sequence, higher temperature stars have - ANSWERS-
higher luminosity
Stars Not on the Main Sequence - ANSWERS-red giants and
supergiants, and white dwarfs
red giants and supergiants - ANSWERS-burning helium not hydrogen
anymore; starting to die; size is large, so they are luminous even though
they are relatively cool
white dwarfs - ANSWERS-hot, small, and dim
planetary nebula - ANSWERS-is the ejected envelope(the layers outside
the core) of a low to intermediate mass star
the end state of a former star's core is - ANSWERS-a white dwarf
Sun's history - ANSWERS-stellar nursery, protostar, main sequence, red
giant, planetary nebula, white dwarf
END OF
PAGE
2
, PSU ASTRO 7N EXAM LATEST
2
"type II" supernova - ANSWERS-a violent explosion with the star's core
left behind; the explosion itself creates a short-lived highly-energetic
environment
if the cores mass is > than 3 solar masses it becomes a - ANSWERS-
black hole
if the core is about 1.4-3 solar masses it becomes a - ANSWERS-
neutron star
The sun is composed mostly of - ANSWERS-gas- 73% hydrogen and
25% helium
Diameter and mass of sun - ANSWERS-diameter: 109x the earth
mass: 333,000x the earth
Luminosity is equal to - ANSWERS-4x10^24 100 Watt light bulbs
99.9% of all the mass of the solar system is ___ - ANSWERS-in the sun
END OF
PAGE
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