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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