They calculate the color of white dwarf stars: some are green

Recent research reveals that white dwarfs can appear in various colors, including yellow, pink, and green, challenging the notion that a star's color is solely determined by its temperature. Traditionally, stars are classified by color based on their temperature, with a spectrum ranging from blue to red. However, white dwarfs, which are the remnants of stars, exhibit different colors due to their atmospheric composition and density. The study led by Mark Hollands utilized spectral analysis to determine the perceived colors of these stars. For instance, some carbon-rich white dwarfs appear pink or purple, while others with sodium and calcium can appear yellow or green. Notably, WD J1330+6435 is identified as the first green star, absorbing orange and violet light. Despite the findings, most white dwarfs remain close to white, with only a small percentage deviating significantly from expected colors. This research emphasizes the importance of color in understanding the chemical…