Spectral class
from class:
Intro to Astronomy
Definition
A spectral class is a classification of stars based on their spectral characteristics, particularly the absorption lines present in their spectra. These classes are primarily determined by a star's surface temperature and are categorized using the letters O, B, A, F, G, K, and M.
congrats on reading the definition of spectral class. now let's actually learn it.
5 Must Know Facts For Your Next Test
- Spectral classes range from hot to cool stars: O (hottest), B, A, F, G, K, M (coolest).
- Each spectral class is further divided into subclasses numbered from 0 to 9.
- O-type stars are blue and have temperatures above 30,000 Kelvin.
- G-type stars include our Sun and have temperatures between 5,300 and 6,000 Kelvin.
- M-type stars are red and have temperatures below 3,500 Kelvin.
Review Questions
- What letter represents the hottest spectral class?
- Which spectral class does the Sun belong to?
- How are spectral classes subdivided?
"Spectral class" also found in:
© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.