1.
Crudelydescribewherethecenterof mass is locatedrelativetothetwostars thatmakeup a binarysystem:all
otherfactorsbeingequal,thecentreof mass is locatedcloser to thecentreof themoremassivestar.
2.
Star Mass of Star 1 Position of Star
1
Mass of Star 2...
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1.
Crudelydescribewherethecenterof mass is locatedrelativetothetwostars thatmakeup a binarysystem:all
otherfactorsbeingequal,thecentreof mass is locatedcloser to thecentreof themoremassivestar.
2.
Star Mass of Star 1 Position of Star
1
Mass of Star 2 Position of Star
2
Position of
CentreOf Mass
System A 6 0 6 10 5
System B 4 0 2 6 2
System C 3 0 6 6 4
3.
If a smallO2 spectraltypestaris completelyobscuredby a large M4 spectraltypestar,thedropin totalluminosityof
thebinarysystemwouldbe bestdescribedas A
4.
L= 4πR2
σT4
σ = StefanBoltzmann constant: 5.
67 × 10 8−
W ·m 2
·K4
Star
Luminosity(L⊙) Radius (R⊙) Temperature(T⊙)
A 9 3 1
B 16 1 2
C 4 .
5 2
5.
A grandfatherclockstartsexactlyat noon.
Imaginethatyou makemeasurementsof theheightof thetipof theminute
handand createa periodicgraphof yourdata(muchlikea lightcurve).
If you makean observationat 2:40pm,
whatwouldbe thephaseof this observation? Explain:
16/24:0.
66
The minutehandwouldbe at 66% of it’s cycle.
6.
Use theverticalredcu
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