PHYS 1902 Quiz 4
Why does the surface of the Sun appear to have a sharp edge?
The photosphere is thin compared to the other atmospheric regions. Correct. The thinness of the photosphere makes the Sun appear to have a distinct edge. See Section 16.1.
Chapter 4 - Spectroscopy
Why do we want to measure optical spectra How do we measure optical spectra
Lecture W.3.a Tools of Astronomy : spectra
Why measure spectra
Spectrum of hot bodies reveals their
Prism with hot lamp
What is another name for an alpha particle?
A helium nucleus
See Section 21.4.
How much energy is carried away from a supernova in the form of neutrinos compared to the energy a supernova emits in the form of electromagnetic radiation?
What is the meaning of zero-age main sequence?
It is the band on the H-R diagram in which stars are arranged as they begin their extended period of stable nuclear fusion.
Correct. The main sequence is the band on the H-R diagram in which most star
100936429 | February 22, 2016
In the article, What Is the Right Price for Carbon Emissions? Bob Litterman tries
to justify by using pricing models and risk management data the effect on climate
Why do we orbit around the Sun?
point furthest away
We have Keplers laws of planetary motion
which describe the planets orbits to some
degree of precision but do not explain why
they are m
Ottawa Clear Sky - Observing Nights
Size, scale and observing the Sky
It is easy to take these for
granted without questioning
where they came from.
courtesy NASA / JPL Caltech
Rsol ~ 700 000km
(or 100 Earth radii)
Galileos sketch of the Pleides
From our Star to the
PHYS 1902 - W2015
Instructor: Jillian Henderson
PhD in Astrophysics at the Institute
of Astronomy, Universidad Nacional
Autonoma de Mexico (UNAM)
Specialization: Neutron Stars and
How we know what we know
Ancient Astronomy and Stellar Positioning
The Sun and the Moon move
across the Sky in an Orderly,
The planets seem to wander retrograde motion.
Inferior planets had
X-ray bursters are caused by a process similar to the process in which other object?
Correct. The only difference in the process for a nova and an X-ray burster is that a nova occurs when a white dwarf is in a binary companionship and an X-ra
Physics1902 Stars:Distances, MagnitudesandTypes
Lecture W4.b Chapter 17
to stars is measured by parallax As earth orbits, changes angle to a star
Lecture W7.a Chapter 18
What are we going to make a star out of? Clouds of gas/dust which collapse?
We actually see different types of clouds
M20 Triffid nebula
Charting the Heavens Ch. 1
We are going to try to get some perspective of our
place in the solar system, in the universe
We need some elements of language to describe our
This chapter is includes an assortment of
Physics 1902 From Stars to the Cosmos
Peter Watson E-mail firstname.lastname@example.org HP3318
Adam Robichaud E-mail email@example.com Marking of assignments, Telescope operations
Weekly Quiz, Bi-
Lecture 11a,b Chapter 26/27
a) There will be one more WebCT quiz before the end of term: deadline will be the last day of classes. b) the final exam (13th April) will be the same format as the midterm. 30 (instead of 20) multiple choi
Lecture W10.a Chapter 24/25
Where are they? What are they made of? How old are they? Do they evolve? Why the different types?
Galaxies appear to come in several different typ
Lecture W9.a Chapter 23
23.1OurParentGalaxyut of our galaxy (red From Earth, we see few stars when looking o
arrows) and many stars when looking in (blue arrows). Milky Way is what our galaxy appears as in the night sky.
Physics1902 NeutronStars,BlackHolesand otherWeirdos
Lecture W9.b Chapter 22
The result of the type II SN is a highly compressed core and the exploding remnants The core is essentially at nuclear densities and is supported by neutron degener
Physics1902 Novae,Supernovaeand Bursters
Lecture W9.a Chapter 22
Name Symbol Z (Charge) Hydrogen Deuterium Helium Carbon Nitrogen Oxygen Sodium Magnesium Silicon Calcium Iron Cobalt Nickel H D He C N O Na Mg Si Ca Fe Co Ni
Lecture W8.a Chapter 20
For most of its life a star will consume hydrogen producing helium Basic (pp) chain dominates in our sun P+p->d + e+ + D + p -> 3He 3 He + 3He -> 4He + p + p
Lecture W7.b Chapter 19
We want to develop a model for the life cycle of a star We believe stars form in regions of space where there is a high gas/dust density Once formed, a star will spend most of its life o
PHYS 1902: From Our Star to the Cosmos
Winter 2015 Course Outline
PHYS 1902: From Our Star to the Cosmos
Starting with the Sun, the course studies its composition and source of power, then compares
our Sun with the other stars in the galaxy and beyond. Mo