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Part of situation: Discovery of first known green white dwarf star (2 clusters)

University of Warwick astronomers discover first known green star

white dwarf green star astronomy planetary debris stellar evolution

Astronomers led by the University of Warwick have discovered the first known green star, a white dwarf designated WD J1330+6435 located in the Draco constellation approximately 280 light-years from Earth. While stellar color is typically determined by temperature—ranging from orange for cool stars to blue for hot ones—this white dwarf exhibits a unique chartreuse or lime-green glow.

The unusual coloration is caused by the star consuming rocky planetary debris. As the white dwarf absorbs material containing elements such as calcium, lithium, and sodium, the extreme density of its atmosphere alters how these atoms interact with light. Specifically, the high density causes sodium atoms to be bombarded by helium, shifting their energy levels so they absorb a wider range of orange and yellow wavelengths, leaving a green appearance.

This discovery challenges the long-held assumption that white dwarfs primarily follow temperature-based color rules. Researchers noted that white dwarfs can actually display a wide spectrum of colors, including pink, purple, cyan, and yellow, depending on their atmospheric chemical composition. For instance, carbon-rich white dwarfs may appear pink or purple, while those enriched by planetary remnants can appear yellow.

Entities

Adam Burgasser · Draco · Hubble Space Telescope · Mark Hollands · Milky Way · RAS Techniques and Instruments · University of Warwick · WD J1011+2845 · WD J1330+6435

Claims

What the coverage asserts, and how many sources carry each claim.

Sources

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Астрономи откриха първото зелено бяло джудже в галактиката [ruse.news]
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Tento biely trpaslík mení všetko, čo vieme o týchto kozmických objektoch: Astronómovia objavili zelenkastú hviezdu [vosveteit.zoznam.sk]
Zelená, růžová a fialová: i takoví mohou být bílý trpaslíci [sciencemag.cz]
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RaillyNews - Discovery of a Green-White Dwarf Star 65 Light Years Away [raillynews.com]
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Uzayın derinliklerinde şaşırtan keşif: İlk kez yeşil parıldayan yıldız tespit edildi [www.gazetebirlik.com]
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Astronomii susțin că au identificat o stea de culoare verde [www.g4media.ro]
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O stea verde, identificată recent, îi uimește pe astronomi (studiu) [agerpres.ro]
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Astronomers say they’ve discovered the first green star [keyt.com]
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First-Ever Green Star Found? White Dwarfs Glow in Colors Astronomers Never Expected: Report [in.mashable.com]
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Astrónomos afirman haber descubierto la primera estrella verde [kvia.com]
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Astronomers discover first known green star [cyprus-mail.com]
Astronomers Just Found the First Green Star Ever Discovered—Right After It Swallowed Its Planets [gizmodo.com]
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