AST201H1 Study Guide - Midterm Guide: Solar Mass, Compact Star, Electron Degeneracy Pressure

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plumbutterfly518

4 Dec 2012

School

UTSG

Department

Astronomy & Astrophysics

Course

AST201H1

Professor

Michael Reid

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AST201H1 Full Course Notes

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100, 000 light years across (diameter across) 1000 light years thick (up and down) Our sun is located about 28, 000 light years from the galactic centre: how much energy would a solar panel absorb if it were located 10. Au from the sun compared to the amount it would absorb if it were 1. Visual we can see both members of the system; this only works for nearby binaries (observe how long each orbit takes) Spectroscopic we see the doppler shift in the light from the system as the two stars orbit one another (the time it takes the spectral lines to shift back and forth) Eclipsing we see the system dim as the stars eclipse one another (the time between eclipses: given a set of stellar spectra, identify which one corresponds to a specified spectral class. Table 15. 1 (page 500-501: what information do you need to calculate a star"s luminosity? (there are multiple possible answers. )

Related Questions

Helium is very common in the Sun and calcium is rare. Why arehelium lines weak and calcium lines strong in the visible spectrumof the Sun?

How would a star regain its state of equilibrium if the energygeneration rate of a star were to become slightly smaller than itsequilibrium?

Why do metal poor stars have the most elliptical orbits? Fromwhere do they obtain their metals?

why do so few visual binary star systems been fully analyzedto reveal individual masses?

When we look at light curve for an eclipsing binary systemwith total eclipses, how can we tell which star is hotter?

Why do extremely cool stars look fainter than we might expectfrom their luminosities and distances?

Why can't we use solar type stars as spiral tracers? what typeof stars make good spiral tracers? why? What characteristics dothey have to perform this function?

in some old, dense stars, a few blue stars, known as bluestragglers are seen. why are blue stars unexpected in suchclusters? If stars that stick together mix their materialthoroughly when they collide, how might you explain such bluestars?

Supposed you jumped into a black hole feet first? what wouldhappen to you? what would your friends who stayed behind actuallysee?

Why are there different types of galaxies?

what is the eventual fate of the milky way galaxy? whatprocess will lead to this fate? can anything change this?

What are the processes that are responsible for the formationof an elliptical galaxy in comparison to a spiral galaxy? Whycannot galaxies evolve from elliptical to spiral and from spiral toelliptical?

Is it surprising that a pulsar is not seen in every supernovaremnant? why?

How do we form the conclusion that quasars are so vary faraway?

How many times longer does a .50 - M star fuse hydrogen atit's core than does a 1.5 - M star?

How many 0.75 - M main sequence stars would it take to equalthe luminosity of one 15 - M star?

Which, if any, of the following statements is/are true?

1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster.
2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago.
3)Planets are believed to have formed by a process known asaccretion.
4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei.
6)The name of the second largest object in the Universe is TheSouthern Wall.
7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt.
8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy.
9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri.
10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale.
11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

AST201H1 Study Guide - Midterm Guide: Solar Mass, Compact Star, Electron Degeneracy Pressure

AST201H1 Full Course Notes

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