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Astronomy | Astrophysics
Distinguish between elliptical, spiral and elliptical galaxies and give one example of
each type of galaxy.
each type of galaxy.
Astronomy | Astrophysics
How long will a 5MΘ star burn hydrogen as fuel, given that the Sun will do so for
about 1010 years?
about 1010 years?
Astronomy | Astrophysics
A white dwarf star has a mass of 1030 kg. Its luminosity is 1024 Js−1. Calculate how
long it can survive with its present luminosity if its internal temperature is 107 K.
long it can survive with its present luminosity if its internal temperature is 107 K.
Astronomy | Astrophysics
Derive an expression for Jeans mass and discuss its significance in the formation of
stars.
stars.
Astronomy | Astrophysics
Describe the composition of the interstellar medium. Explain how it has been
possible to map the HI clouds.
possible to map the HI clouds.
Astronomy | Astrophysics
Derive the expression for the mean temperature in a star:
2/3 1/3
< T > ∝ M < ρ >
2/3 1/3
< T > ∝ M < ρ >
Astronomy | Astrophysics
A star has surface temperature of 25000 K. Which lines would be prominent in its
spectrum and why?
spectrum and why?
Astronomy | Astrophysics
The mean distance of Mars from the Earth is 0.5 A.U. and its orbital period is 687
days. Calculate the orbital period of Jupiter given that its mean distance from the
Earth is 4 A.U.
days. Calculate the orbital period of Jupiter given that its mean distance from the
Earth is 4 A.U.
Astronomy | Astrophysics
Explain how sunspots survive for so long even though they are surrounded by hotter
matter.
matter.
Astronomy | Astrophysics
A main sequence star has mass 2×1031 kg and radius 3×109
m. Obtain an estimate of
the average temperature throughout the star.
m. Obtain an estimate of
the average temperature throughout the star.
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