GD 362 is a white dwarf star approximately 150 light years from Earth. In 2004, spectroscopic observations showed that it had a relatively high concentration of metals in its atmosphere. Since the high gravitational field of white dwarfs quickly forces heavy elements to settle towards the bottom of the atmosphere, this meant that the atmosphere was being polluted by an external source.

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dbpedia-owl:abstract
  • GD 362 (G 204-14 / WD 1729+371 / EGGR 545) es una enana blanca en la constelación de Hércules, con magnitud aparente +15,7. Se encuentra a unos 150 años luz de distancia de la Tierra y su edad como enana blanca es de 900 millones de años. En 2004, observaciones espectroscópicas mostraron que GD 362 tenía una concentración relativamente alta de metales en su atmósfera. Dado que el fuerte campo gravitatorio de una enana blanca fuerza a los elementos pesados a hundirse rápidamente en la parte baja de la atmósfera, esto significaba que la atmósfera estaba siendo contaminada por una fuente externa. Posteriores observaciones de fotometría infrarroja sugieren que la estrella está rodeada de un anillo de polvo comparable a los anillos de Saturno, lo que explica la contaminación. Un posible origen del disco de polvo y de los elementos pesados en la atmósfera puede deberse a la desintegración por las fuerzas de marea de un asteroide de unos 200 km de diámetro hace entre 100.000 y un millón de años. Si éste es el origen, los espectros indican que la composición del asteroide sería similar a la de la corteza terrestre, y que podría haber pertenecido a un cuerpo mayor no muy diferente a los planetas terrestres del Sistema Solar.
  • GD 362 is a white dwarf star approximately 150 light years from Earth. In 2004, spectroscopic observations showed that it had a relatively high concentration of metals in its atmosphere. Since the high gravitational field of white dwarfs quickly forces heavy elements to settle towards the bottom of the atmosphere, this meant that the atmosphere was being polluted by an external source. In 2005, infrared photometric observations suggested that it was surrounded by a ring of dust with size comparable to the rings of Saturn, providing an explanation for this pollution. In 2006, Benjamin Zuckerman, Michael Jura and other astronomers used the Keck telescope to obtain high-resolution spectra of GD 362 which showed that heavy elements in the star's atmosphere occurred in concentrations similar to those in the Earth-Moon system. The group concluded that a possible origin for GD 362's dust ring and atmospheric pollutants was that a rocky asteroid about 200 km in diameter was disintegrated by tidal effects between 100,000 and 1 million years ago. If this was the origin, the spectra indicate that the asteroid should have had composition similar to the Earth's crust, suggesting that the star might have had an Earth-like planet before it entered its red giant phase. GD 362 has been a white dwarf for approximately 900 million years.
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  • GD 362 (G 204-14 / WD 1729+371 / EGGR 545) es una enana blanca en la constelación de Hércules, con magnitud aparente +15,7. Se encuentra a unos 150 años luz de distancia de la Tierra y su edad como enana blanca es de 900 millones de años. En 2004, observaciones espectroscópicas mostraron que GD 362 tenía una concentración relativamente alta de metales en su atmósfera.
  • GD 362 is a white dwarf star approximately 150 light years from Earth. In 2004, spectroscopic observations showed that it had a relatively high concentration of metals in its atmosphere. Since the high gravitational field of white dwarfs quickly forces heavy elements to settle towards the bottom of the atmosphere, this meant that the atmosphere was being polluted by an external source.
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  • GD 362
  • GD 362
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