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Project “COLOR” due TODAY
Project “Spectral Types” due Tuesday, October 6th
Homework set #3 (due Thursday October 8th before class)
Problems (5.)1 (40 points), (5.)3 (20 points), (5.)11 (40 points),
and (5.)17 (20 points), (8.)1 (20 points), (8.)5 (20 points), (8.)15
(20 points), and (8.)16 (20 points)
Total available points: 200.
Bonus problem: (8.)9B (20 points, i.e., 10%; only part B)
A few things to conclude the lecture on Tuesday…
Binary Systems (Lecture 8)
Lecture notes... Chapter 7 in Carroll&Ostlie OR
Chapter 4 in the Customized book.
Which of these is physically wrong if they are
all main sequence stars?
When would you receive the least amount of light from a
binary star system consisting of an M5 Red Giant and an
M5 main sequence star?
(A) When the Red Giant is in front of the main
sequence star
(B) When the Red Giant is behind the main sequence
(C) You would receive the same amount of light from
both situations described in choices “A” and “B”
(D) None of the above
The sketches illustrate how two main sequence stars might look at three
different times. In which case would the amount of light we would
observe from Earth be the least?
(A) at time A
(B) at time B
(C) at time C
(D) at more than one of the times
(E) there is not enough information to determine this