The Surface Temperature of a Nearby Star Can Be Determined

question 234

Multiple Choice

The surface temperature of a nearby star can be determined most precisely by measuring what parameters?

• A) the position of the star on the H-R diagram
• B) the Doppler shift of the star's spectral lines
• C) the relative strengths of emission lines from different atoms and ions in the star's spectrum
• D) the relative strengths of absorption lines from different atoms (e.g., H, Ca) and molecules (e.g., TiO) in the star's spectrum

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