Features of Stellar Spectra – Classifying Stars (HSC SSCE Physics): Flashcards
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Fraunhofer lines
Fraunhofer lines
Absorption lines in Sun's spectrum
Coolest star colour
Coolest star colour
Red
Hottest star colour
Hottest star colour
Blue or white
Cause of Balmer absorption lines
Cause of Balmer absorption lines
Hydrogen atoms in star's atmosphere
Temperature for strongest Balmer lines
Temperature for strongest Balmer lines
Around 10,000 K (spectral class A)
Why hottest stars lack Balmer lines
Why hottest stars lack Balmer lines
Hydrogen is completely ionised
Spectral sequence, hottest to coolest
Spectral sequence, hottest to coolest
O B A F G K M
Sun's spectral classification
Sun's spectral classification
G-type star
What broad spectral lines indicate
What broad spectral lines indicate
High atmospheric pressure (compact stars)
White dwarf
White dwarf
Star remnant in final cooling, no longer fusing nuclei