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School
University of Toronto *
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Course
201
Subject
Astronomy
Date
Jan 9, 2024
Type
Pages
3
Uploaded by BailiffElkMaster114
AST 201 FINAL ASSIGNMENT
Due: Friday. Apr. 24, 2020 at 5 pm
Please submit electronically via Quercus
Student name:
Sara Zawahid
Student number:
1006308504
Part 1 – Short Answer Questions
Total: 20 marks
Question 1:
a)
[3 marks]
The spectral type of this star is A. Stars in class A have spectra with strong hydrogen absorption
lines and no molecular absorption lines. Stars of this class are also found on rhe main sequence
as well.
b)
[3 marks]
Since this star is in the main sequence, the next phase of its life will start once it finishes fusing
hydrogen molecules and forming helium in its core. Then the core collapses onitself, turning
into a sub giant star, then it becomes a red giant star. It becomes cooler, as a red giant, then
becomes a supernovae. Finally it will end its life as a white dwarf.
c)
[2 marks]
Yes, these mesurements are consistant with Kepler’s Law. Kepler’s Third Law states that more
distant plants orbit slower than closer ones. The third planet is the furthest from the star with 8.2
AU from the star and has an orbital period of 3.5 years, which follows Kepler’s Third Law. The
other planets with a lower AU have lower orbital periods than the furthest planet. Thus, are
consistent with Kepler’s Law.
d)
[2 marks]
Yes, these measurments are consistent with the Milky Way having a significant dark matter
compenent.
Question 2:
a)
[1 mark]
The normalised apparent brightness of my galaxy would decrease.
b)
[2 marks]
You would get emmision lines on this spectrum by coressponding the amount of energy that is
emmited . Below is an example of a hydrogen atom.
- Electron
-
Proton
c)
[1 mark]
The wavelength on the galaxy spectrum is about 7950. So, the difference would be 1387.
7950 - 6563 = 1387.
d)
[1 mark]
The line shifted to longer wavelengths than we see on Earth.
e)
[1 mark]
z = (7950 – 6563) ÷ 6563
= 0.211
f)
[1 mark]
This relationship between the distance and the redshift tell us about how the Universe is
expanding.
g)
[1 mark]
Hubble’s Law supports the Big Bang model of cosmology as it states that the universe has a
redshift so it is expanding which makes it move away from itself.
h)
[2 marks]
Other observations that support the Big Bang model are the cosmic microwave background
radiation and the fact that there is an abundance of hydrogen, helium, deuterium, and lithium.
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