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Unformatted text preview: (assuming both stars are the same size)? b. What is the predominant color of each star in part (a)? Use the Wien displacement law and express your answers in wavelengths. 5) At what wavelengths will the following spectral lines be observed: a. A line emitted at 500 nm by a star moving towards us at 100 km/s b. A radio line with a rest frequency of 1420.4 MHz emitted by a cloud of neutral hydrogen moving away at 200 km/s. 6) Estimate the line width for a calcium line at 393.3 nm and for a hydrogen line at 410.1 nm for the following three cases: a. A star at 3,000K. b. A star at 6,000K. c. A star at 12,000 K. d. Describe and explain the relationships of temperature and mass with line width ....
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- Winter '08