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Lecture

ASTA02H3 Lecture Notes - Balmer Series, Stellar Classification


Department
Astronomy
Course Code
ASTA02H3
Professor
Parandis Khavari

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Astronomy - Session 4
energy and frequency and wavelength
 
longer wavelengths result in smaller frequencies
   (or   
)
spectral classification
only see weak Balmer lines
approx. temperature of the Sun results in weak Balmer lines
approx. 10,000 K (excited) results in strong Balmer lines
classification of stars
based on temperature
O stars low H because at high temperatures, most H atoms are ionized
ex. of a G-class star
Sun
at K and M stars, what happens at absorption lines
molecules
(if T is very high: no chemical bonds can form, no molecules)
stars chart
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