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1. Astronomers have measured the distance, surface temperature, and the flux at earth for some nearby stars. Use this information to determine the luminosity and radius of the stars. a) b) c) d) e) Star Vega Procyon tau Ceti Arcturus Aldebaran Distance 7.7 pc 3.5 pc 3.65 pc 11.3 pc 20 pc Temperature 9600 K 6500 K 5300 K 4300 K 3900 K Flux 2.2 x 10^(-5) erg/cm^2 s 1.8 x 10^(-5) erg/cm^2 s 1.25 x 10^(-6) erg/cm^2 s 4.3 x 10^(-5) erg/cm^2 s 3.4 x 10^(-5) erg/cm^2 s

1. Astronomers have measured the distance, surface temperature, and the flux at earth for some nearby stars. Use this information to determine the luminosity and radius of the stars. a) b) c) d) e) Star Vega Procyon tau Ceti Arcturus Aldebaran Distance 7.7 pc 3.5 pc 3.65 pc 11.3 pc 20 pc Temperature 9600 K 6500 K 5300 K 4300 K 3900 K Flux 2.2 x 10^(-5) erg/cm^2 s 1.8 x 10^(-5) erg/cm^2 s 1.25 x 10^(-6) erg/cm^2 s 4.3 x 10^(-5) erg/cm^2 s 3.4 x 10^(-5) erg/cm^2 s

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1. 2. Astronomers have measured the distance, surface temperature, and the flux at earth for some nearby stars. Use this information to determine the luminosity and radius of the stars. a) b) d) e) Star Vega Procyon tau Ceti Arcturus Aldebaran Distance 7.7 pc 3.5 pc 3.65 pc 11.3 pc 20 pc Temperature 9600 K 6500 K 5300 K 4300 K 3900 K Flux 2.2 x 10^(-5) erg/cm^2 s 1.8 x 10^(-5) erg/cm^2 s 1.25 x 10^(-6) erg/cm^2 s 4.3 x 10^(-5) erg/cm^2 s 3.4 x 10^(-5) erg/cm^2 s The astronomers have asked you to help them make sense of what they have measured about their stars. You know all about the Hertzsprung-Russell diagram. What kind of star (red giant, white dwarf, main sequence, etc) would you say each of the stars in problem 1 is? What do you think each is doing to generate all of the energy it is radiating into space as starlight?
Transcribed Image Text:1. 2. Astronomers have measured the distance, surface temperature, and the flux at earth for some nearby stars. Use this information to determine the luminosity and radius of the stars. a) b) d) e) Star Vega Procyon tau Ceti Arcturus Aldebaran Distance 7.7 pc 3.5 pc 3.65 pc 11.3 pc 20 pc Temperature 9600 K 6500 K 5300 K 4300 K 3900 K Flux 2.2 x 10^(-5) erg/cm^2 s 1.8 x 10^(-5) erg/cm^2 s 1.25 x 10^(-6) erg/cm^2 s 4.3 x 10^(-5) erg/cm^2 s 3.4 x 10^(-5) erg/cm^2 s The astronomers have asked you to help them make sense of what they have measured about their stars. You know all about the Hertzsprung-Russell diagram. What kind of star (red giant, white dwarf, main sequence, etc) would you say each of the stars in problem 1 is? What do you think each is doing to generate all of the energy it is radiating into space as starlight?
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