What are at least five observable properties of stars? In each case, give at least one...
What are at least five observable properties of stars? In each case, give at least one way we can measure these properties using starlight. What are the extremes for these observable properties of main-sequence stars (for example, what is the lowest mass a main-sequence star is observed to have)?
Homework Answers
Lumiosity-Total amount of energy produced in a star and radiated into space in the form of E-M radiation
Two things are needed to find luminosity .These are brightness and distance.Using Inverse Square law,Luminosity is found out
The Sun radiates 
ergs/sec.
Temperature-Temperature varies between different stars.It can be calculated by
Either from colors (and blackbody laws) or more detailed spectra
The Star WR102 which is a blue star with surface Temperature of over 2,10,000 kelvin is the hottest star ever
Diameter-Diameter can be calculated by
Luminosity combined with temperature
VY Canis Majoris is the largest star,2600 times bigger than sun
Composition-Composition means which things it is made up of
It is calculated using Spectra.
Stars have different chemical compositions, depending on their age and time of formation.
Wolf–Rayet stars are one example of hydrogen rare stars.
Color-Different stars have different colour
It is measured using star light
Stars vary in colour ranging from orange through true white to blue. Colour is caused by the temperature of the surface of the star.
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What are at least five observable properties of stars? In each
case, give at least one...
What is the reason for two stars to have the same brightness but one being 100...
What is the reason for two stars to have the same brightness but one being 100 times more luminous than the other? One of them is 100 times more distant One of them is 10 times more distant One of them is 1000 times more distant One of them is 4π times more distant The Brightness scale like the inverse of the square of the distance (1/R2) T F What is parallax? The distance of a star A method to...
1.What process is pushing back against gravity in the very center (the core) of sun-like stars?...
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1. If you look at the CMD of NGC 6397 in the lower-right corner, what are...
1. If you look at the CMD of
NGC 6397 in the lower-right corner, what are the stars there? There
are no stars here fainter
than I = 25. Why do you think this is? What is it telling
us?
2.If you look at the CMD of NGC 6397 in the lower-left corner,
what are the stars there? There are no stars here fainter
than I = 28. Why do you think this is? What is it telling
us?
The...
123 Binary Stars 7) Imagine that you are watching a binary star system chtas they eaomntar....
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Astronomers have observed a small, massive object at the center of our Milky Way galaxy. A...
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5) A star (no matter what its mass) spends most of its life Select one: a....
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list 4 attributes of critical thinking and give at least one example of each, then select...
list 4 attributes of critical thinking and give at
least one example of each, then select one of the attributes and
relay a professional instance when either you(or have seen a
co-worker)use critical thinking related to that
attribute.
List at least 4 attributes of critical thinking and give at least one example of each, then select one of the attributes and relay a professional instance when either you (or have seen a co-worker) use critical thinking related to that attribute.
What is the Cost of Equity? Provide a definition, and suggest least one way that we can estimate it. How does this measure reflect risk, and what will make it change? b. What is the Cost of Debt? P...
What is the Cost of Equity? Provide a definition, and suggest least one way that we can estimate it. How does this measure reflect risk, and what will make it change? b. What is the Cost of Debt? Provide a definition, and suggest least one way that we can estimate it. How does this measure reflect risk, and what will make it change?
Could one of the stars listed in the table above be an RR Lyrae star?
Cosmic DistancesDISTANCE MODULUS- For this lab, we will focus on two techniques that can be used to measure the distance modulus of objects in deep space - supernovas and Cepheid variable stars. Before we begin, though, we must understand what "distance modulus" means.- Read through the background material on distance modulus.- Use the distance modulus page to complete the following table:ObjectApparent Magnitude (m)Absolute Magnitude (M)Distance Modulus (m-M)Distance (pc)Star A2.410Star B516Star C1025Star D8.50.5- Could one of the stars listed in the...
1.Explain case-control and cohort study designs? How do the two designs differ? Give at least one...
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1. If you look at the CMD of
NGC 6397 in the lower-right corner, what are the stars there? There
are no stars here fainter
than I = 25. Why do you think this is? What is it telling
us?
2.If you look at the CMD of NGC 6397 in the lower-left corner,
what are the stars there? There are no stars here fainter
than I = 28. Why do you think this is? What is it telling
us?
The...
123 Binary Stars 7) Imagine that you are watching a binary star system chtas they eaomntar. And I type main sequence star and a B-spectral type main sequence sta orbit. During this time, you are able to see the starst of the M-S mvedstars At another time, you see the B-spectral type star in at an entirely different time, you see that the B-spectretches showing M-spectral type star. In the space below, draw three would look like at the three...
list 4 attributes of critical thinking and give at
least one example of each, then select one of the attributes and
relay a professional instance when either you(or have seen a
co-worker)use critical thinking related to that
attribute.
List at least 4 attributes of critical thinking and give at least one example of each, then select one of the attributes and relay a professional instance when either you (or have seen a co-worker) use critical thinking related to that attribute.
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