Download Properties of Main Sequence Stars

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Transcript
Properties of Main Sequence Stars
10 points Extra Credit. Due next class.
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.
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.
O5:
M5:
Calculate the lifetime of an O5 and M5 main sequence star relative to the Sun’s lifetime.
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.
Wien’s Law: T (k ) 
2.9  106 k  nm
Max (nm )
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
2.9 M
1.8 M
0.1 R
1