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staedtler staedtler
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The technique called photometry in stellar astronomy is the measurement of
A)   the arrival times of photons from variable and pulsating stars, in order to determine accurately the pulsation or rotation periods of these stars.
B)   the intensity of light from stars through several limited-bandpass filters from which surface temperature, variability, luminosity, etc., of stars can be determined.
C)   the relative absorption of light by different atoms and molecules in high-resolution spectra of starlight, from which stellar temperatures can be estimated.
D)   the precise positions and relative motions of stars in the Galaxy, from which galactic structure and overall rotation can be determined.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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papachulopapachulo
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staedtler Author
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7 years ago
I really appreciate your help!
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