i) Explain how distance to stars is calculated. ii) Explain how the temperature and elemental composition of a star is determined. iii) Which star has a hotter surface temperature? How do you know? iii) Which star is redder, which is bluer? How do you know? iv) Which star is brighter? Why?
Possible Learning Materials/Activities to Use
Vocabulary
1.2 Questions
Discussion: EM Tools through the Ages
Watch: Cosmos: Sisters of the Sun
Activity: 1.21 - Astrometry - Temperature, Elemental Composition
Discussion: Barcodes Everywhere!
Activity: 1.22 - Astrometry - Distance, Luminosity
Discussion: Perceiving Distance in the Sky
Review: Energy and Astrometry
1.2
spectroscopy
spectrum
continuous
emission
absorption
black body
absorption. emission lines
M-K Classification System
Hertzsprung–Russell diagram
luminosity
flux
magnitude
apparent
absolute
Wien’s Law
1.2 - Two bright stars currently in our October night sky include Deneb and Arcturus. Their information is given above and below. i) Explain how distance to stars is calculated. ii) Explain how the temperature and elemental composition of a star is determined. iii) Which star has a hotter surface temperature? How do you know? iii) Which star is redder, which is bluer? How do you know? iv) Which star is brighter? Why? (Your response should discuss the tools involved in spectroscopy, components and behaviors of subatomic particles and their role in spectroscopy, and the relationship between energy, temperature, and light color.)
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