Download Properties of Main Sequence Stars

Quiz on Main Sequence Stars
Due next class.
Name________________________________
Class Meeting Time____________
Determine approximate values of the luminosity, temperature, mass and radius of an O5 and M5 main sequence
star using the HR diagram on the accompanying page or use the HR diagrams in the text (Unit 59).
Spectral Type
O5
G2
M5
Absolute
Magnitude
-6
+5
+12
Luminosity
(LSun)
Temperature
(K)
Mass (MSun)
Radius (RSun)
1
5,800
1
1
Calculate the density of an O5 and M5 main sequence star relative to the Sun’s density. Record your answer
below and show your calculations on a separate page.
O5:
M5:
Calculate the lifetime of an O5 and M5 main sequence star relative to the Sun’s lifetime. Record your answer
below and show your calculations on a separate page.
O5:
M5:
Calculate the wavelength at which an O5 and M5 main
sequence star radiates the strongest using Wien’s Law
and identify the region of the electromagnetic spectrum
at which the star radiates most strongly.
The Electromagnetic Spectrum
Region
Wavelength Range
Gamma Rays
X-Rays
Ultra-violet Rays
Visible Light
Infrared Radiation
Microwaves
Radio Waves
Less than 0.01 nm
0.01 nm
to 10 nm
10 nm
to 380 nm
380 nm
to 740 nm
740 nm
to 200,000 nm
200,000 nm to 5 x 106 nm
Greater than 5 x 106 nm
-10
30,000 K 9,500 K
7,200 K
60 M
nitude
-5
17.5 M
5.9 M
0
5
2.9 M
1.8 M
0.1 R
1