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Astronomers Found Something They Thought Couldn't Exist: A Green Star
ZME Science • • science
Key Points:
- Stars typically do not appear green because their light is a mix of many colors, and when combined, green wavelengths are balanced by red and blue, resulting in stars appearing white or other colors depending on temperature.
- The star WD J1330+6435, a white dwarf with an unusual atmosphere containing sodium and calcium, absorbs certain colors of light, allowing green wavelengths to dominate and giving it a pale yellowish-green (chartreuse) appearance.
- This green appearance is not from direct imaging but inferred through spectral analysis and atmospheric modeling combined with simulations of human color perception.
- WD J1330+6435 is one of a few rare white dwarfs with unusual colors caused by atmospheric chemical pollution, which also provides clues about the remnants of planetary material around these stars.
- The discovery challenges the long-held belief that green stars cannot exist, showing that stellar color can reveal both temperature and chemical composition, as well as past planetary interactions.
