A Green Star? Astronomers Uncover a Rare Cosmic Mystery
Astronomers have discovered the first-ever genuinely green star. The white dwarf, named WD J1330+6435, is located about 326 light-years away. The study, titled ‘White Dwarfs Really are White, But Few are Green, Pink or Vivid Blue,’ was published in RAS Techniques and Instruments (RASTI). Led by Dr. Mark Hollands at the University of Warwick in England the research relied on unique white dwarf spectral models.
The spectrum models werecross-referenced with observations of light spectra from the Sloan Digital Sky Survey (SDSS) telescope in New Mexico.
Core Finding of the Study
According to the laws of physics, a star’s color is purely a reflection of its temperature. Orange indicates a cooler temperature, while blue indicates a hotter temperature. This happens because stars act as “perfect radiators”. However, white dwarfs deviate from this pattern because of their extreme density. For instance, WD J1330+6435 is pulling in and shredding orbiting rocky planets and asteroids.
In addition, planetary debris has heavily polluted the star’s outer layers. The outer layers now contain calcium, lithium, and high concentrations of sodium. Under the intense pressure of the star’s dense helium plasma, the sodium operates as a massive sponge. Under these conditions, its absorption broadens and wipes out the orange, red, and yellow wavelengths of light. With the warm-colored light filtered out, a visible green glow remains.
https://insiderpaper.com/a-green-star-astronomers-uncover-a-rare-cosmic-mystery/
They found it
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