**AF Columbae**
**Definition:**
AF Columbae is a variable star located in the constellation Columba. It is classified as a red giant exhibiting semiregular variability in its brightness.
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**AF Columbae**
AF Columbae is a red giant star situated in the southern constellation of Columba. It is known for its semiregular variability, with its apparent magnitude fluctuating between approximately 5.9 and 6.4. The star is classified as an M-type giant, indicating a cool surface temperature and a reddish hue.
### Location and Visibility
AF Columbae lies in the relatively faint constellation Columba, which is best observed from the Southern Hemisphere. Its brightness variations make it an interesting object for amateur astronomers studying variable stars.
### Variability
As a semiregular variable star, AF Columbae exhibits periodic changes in luminosity, though these changes are not strictly regular. This variability is typical of red giants undergoing pulsations in their outer layers.
### Physical Characteristics
The star’s spectral type is M2III, denoting a giant star with a cool surface temperature around 3,500 K. Its expanded outer envelope and advanced evolutionary stage contribute to its variability and reddish color.
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**Meta Description:**
AF Columbae is a semiregular variable red giant star in the constellation Columba, known for its fluctuating brightness and cool surface temperature.