N/A
kT 2.12 2.14 1.58 1.80
nH
Fe
S 0.43 0.30 0.97 0.28
Si
Ca
Mg 0.007 .075 0.0 0.0
Quality
of fit
1) Element Ranges:
kT 2.14 / 1.58 = 1.35_______________________________
nH ________________________________________
Fe ________________________________________
S ________________________________________
Si ________________________________________
Ca ________________________________________
Mg ________________________________________
2) Element Concentration versus Increasing Temperature:
kT 1.58 1.80 2.12 2.14
nH
Fe
S 0.97 0.28 0.43 0.3
Si
Ca
Mg
3) Temperature relationships:
a. Do you see a relationship between Fe concentration and temperature?
b. If “Yes” then what is the relationship?
c. Do you see a relationship between Si concentration and temperature?
d. If “Yes” then what is the relationship?
e. Do you see a relationship between Ca concentration and temperature?
f. If “Yes” then what is the relationship?
g. Do you see a relationship between Mg concentration and temperature?
h. If “Yes” then what is the relationship?
i. Do you see a relationship between nH concentration and temperature?
j. If “Yes” then what is the relationship?
4) Would you expect a relationship between nH and temperature? Explain.
For the remaining questions, be sure you base your answers off of the question as written in the Lab Manual. If you base it off the (highly paraphrased) versions here, you might leave out a key detail and lose points!
5) Where does the extra iron come from?
6) How would the iron concentration in the nearby clouds change a million years later?
7) The cloud collapses and stars form. How does the iron in these new stars compare to the iron in the generation that formed before Cas A?
8) So which of the two stars described is probably more recently formed?
9) Current iron levels in the Orion Nebula?
10) How does the iron level of the stars compare to the levels in the surrounding Nebula?
11) It’s 2 billion years later and you’re back at the Nebula! You observe two yellow stars; one formed at the same time as the massive stars, the other formed after they died. How can you tell which is which?
Sample Solution