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Study Guide

Astronomy 1021- Final Exam Guide - Comprehensive Notes for the exam ( 49 pages long!)


Department
Astronomy
Course Code
ASTR 1021
Professor
Robert Cockcroft
Study Guide
Final

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Western
Astronomy 1021
Final EXAM
STUDY GUIDE

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Astronomy 1021: Week 8 - Chapter 5
-telescope > bigger the better
>the bigger the diameter of the lens, the greater chance of collecting photons
-A = piR^2
> square law
>when dealing with diameter, think of area
ex with LC:
16/8 = 2 -> 2^2 = 4 times
16/4 = 4 -> 4^2 = 16 times
-resolving power = how good is your angular resolution
> how well you can separate two objects in the sky
> measure in angular units
-our eyes are good to about 1 arc minute
>less than 1 arc minute then you can’t see detail, but more so a blur
>depends on how far one object is from the other and how far your object is
>the lowest angular resolution that can be achieved with a given telescope: diffraction limits
-magnification is changed with the eye pieces
>smaller objects would use higher magnification (increase the magnification)
-Refractors vs Reflectors
>refractors use lenses
>reflectors use mirrors
>you can make mirrors bigger as opposed to making lenses bigger
>> larger mirrors are easier to make (cheaper) and instal
>lenses have more optical aberrations
>spherical = blurry
>chromatic = colours not aligned
LC
>the most distortion is the Newtonian
>then Prime
>then Cassegrain
>the least distortion is the Coude
-exam: he can ask you to identify which telescope this is (coude, prime, etc)
-false colour images aren't necessarily false images
-spectroscopy requires more light than imaging because it needs to separate the wavelengths
-stars twinkle because of winds and currents
>twinkling = scintillation
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-if you want to go to the emote mountains to observe things, then you have to account for the 4
factors: clam, high, dark, dry
-you can put multiple dishes together, as opposed to one big dish
-x-rays and gamma rays are difficult because they can penetrate easily
>They are energetic. Gamma rays are more energetic
Hubble: low Earth orbit
Chandra; high Earth orbit
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