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Student Notes th Source: Physics for the IB Diploma, 5 Ed, Tsokos E3 STELLAR DISTANCES E4 COSMOLOGY Source: Physics for the IB Diploma, 5th Ed, Tsokos EXAMPLE 1 The distance to the star Epsilon Eridani is 10.8 ly. What is it’s parallax angle? [0.30”] 1 Source: http://frigg.physastro.mnsu.edu Source: Stars and Planets Field Guide, Menze/Pasachoffl EXAMPLE 2 Determine the apparent magnitude of a star whose apparent brightness is 6.43 x 10-9 W m-2. [1.48] EXAMPLE 3 Determine the apparent brightness of a star having apparent magnitude m = 4.35. [4.58 x 10-10 W m-2] 2 Source: Physics for the IB Diploma, 5th Ed, Tsokos Source: Physics for the IB Diploma, 5th Ed, Tsokos . EXAMPLE 4 Calculate the absolute magnitude of a star whose distance is 25.0 ly and whose apparent magnitude is 3.45 [4.03] EXAMPLE 5 Using the data above, determine the distance to the star Sirius. [2.7 pc] 3 EXAMPLE 6 A main sequence star emits most of its energy at λ = 2.4 x 10-7 m. Its apparent brightness is measure at 4.3 x 10-9 W m-2. How far away is the star? [28 pc] EXAMPLE 7 Determine the distance between Earth and the star whose light curve is shown. [520 pc] 4