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lec24 - Lecture 24 Review Chapters 13-16 Lecture 24 Purdue...

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Lecture 24 Review: Chapters 13-16 Purdue University, Astronomy 364 1 Lecture 24
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Reminder HW05 is ready to be picked up. HW06 will be due during the exam on Wed. Exam #2 will be on March 23 8-9 pm in Rm 203 (PHYS). Details can be found on the course web page. Lecture 23 Purdue University, Astronomy 364 2
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Chapter 13 Apparent magnitude: measures flux. – Is an observable. – Uses the star Vega as a reference. – Usually defined for a wavelength range (e.g., visual band). Absolute magnitude: measures luminosity. – Is not an observable. – Defined as apparent magnitude at a distance of 10 pc. – Usually defined for a wavelength range. Distance modulus: the difference in apparent and absolute magnitudes yields distance. Lecture 24 Purdue University, Astronomy 364 3
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Reminder HW05 is ready for pick-up. HW06 will be due on March 23 (before the exam). Exam #2 will take place on March 23 8-9 pm in Rm 203 (PHYS). Details can be found on the course web page. Lecture 23 Purdue University, Astronomy 364 4
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Chapter 13 Color index: measures the difference in apparent magnitudes in two different wavebands.
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