(J28) On the graph on the right what is happening at number1?
(J29) On graph on the right what types of objects are located at number 2? at number 3?
(J-misc) Identify the types of stars
(evolutionary state) to be found at each location in the HR diagram to the right.
Arrange the stars O, T, V in a proper evolutionary sequence.
Arrange the stars J, N, P, R, U in a proper evolutionary sequence.
Arrange the letters K, O, P, Q, S, M in order of stellar mass.
In the Penn State Competition, the diagram with used without labels on the axes.
(L1) What are the units listed on the left side vertical axis? (Absolute magnitude)
(L2) What are the units listed on the top horizontal axis? (Temperature in degrees Kelvin)
(L3) What are the units listed on the bottom horizontal axis? (Spectral Class)
(L4) What are the units listed on the right-side vertical axis?(Luminosity in solar units)
Select the appropriate lettered position for each question.
(L5) Where on the diagram would the remnant from a sun-like star be found?
(L6) Which region would contain a main-sequence star 121 light years away with an apparent magnitude of +0.85?
(L7) Where on the diagram would you find a star with spectral class K and luminosity class III?
(L8) Which lettered region would contain stars with the largest radius?
(L9) Which lettered region(s) would contain stars with the highest luminosity?
(L10) Which lettered region would contain stars with the highest surface temperature?

(L11) Which contain mainthe least mass?
(L12) Which be associated with a period of 11 hours?
(L13) Which contain the star curve shown lettered region would sequence stars with lettered region would variable star with a lettered region would producing the light below?
(Mc26) Where on the diagram is hydrogen being fused into helium as the main source of energy?
(Mc27) At which location would the youngest object be found?
(J36) Which of the two clusters shown above (A or B) is older?
(J37) How old is cluster A in years?
Two main sequence stars appear equally bright in the night sky. Star D has a spectral class of M2 and Star E has a spectral class of B8.
(K40) Which has a greater absolute magnitude?
(K41) How many magnitudes greater?
(K42) Which is hotter?
(K43) Which emits more energy per unit surface area?
(K44) How many times more?

(K45) Which is farther from the observer?
(K46) How many times farther?

Answers
J28 - Turn-off point, main sequence stars to giants
J29 - main sequence stars, giants
J-misc
O, P, Q M, S - main sequence (M is sun-like, S is low mass, K, O are high mass
U, L, T are giants
V, T are supergiants
R, J are white dwarfs
OVT is an evolutionary sequence, PNURJ is an evolutionary sequence
KOPQS is a mass sequence.
L5 - R or J
L6 - ~O
L7 - L
L8 - T
L9 - K, V, or O
L10 - K
L11 - S
L12 - N
L13 - V(?)
Mc26 - K, O, P, Q, M, S
Mc27 - K
J36 - A
J37 - 13 Gyr
K40 - Star E
K41 - 10 magnitudes
K42- Star E
K43 - Star E
K44 - (39) (or more like 100-200 times?)
K45 - Star E
K46 - 100 times farther