To be bright you need to be hot, close or have a large surface area.
The brightest coolest stars are red super giants. They have such a large surface area, that even though their surface temperature is cool - in star terms - their large surface area makes them appear bright.
the ones in the sky
Red giants.
Hot stars are found in the left hand side of the diagram, cool stars the right, bright stars at the top, and lastly the faint stars are located at the bottom.
top,right
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
Cool red giant stars are located in the upper right corner of the Hertzsprung-Russell diagram, where they are both cool (low temperature) and bright (high luminosity). These stars have evolved from main sequence stars and are in a late stage of stellar evolution.
The flag has strips and bright stars
The ISBN of The Stars in the Bright Sky is 9780099461821.
The Stars in the Bright Sky was created in 2010.
The celestial bodies are especially bright on a cool, clear night.