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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation
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Una enana blanca con una atmósfera de oxígeno

S O Kepler1, Detlev Koester2, Gustavo Ourique3

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-900 Porto Alegre, RS, Brazil. kepler@if.ufrgs.br.

Science (New York, N.Y.)
|April 2, 2016
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Resumen

Los astrónomos descubrieron una estrella enana blanca única con una atmósfera casi completamente hecha de oxígeno. Este hallazgo desafía los modelos atmosféricos típicos de enanas blancas y ofrece información sobre la evolución estelar.

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Área de la Ciencia:

  • Astronomía y astrofísica
  • Evolución estelar
  • Estrellas enanas blancas

Sus antecedentes:

  • Las estrellas enanas blancas suelen tener atmósferas dominadas por elementos ligeros como el hidrógeno y el helio debido a la difusión gravitacional.
  • Se espera que las estrellas con masas iniciales por debajo de aproximadamente 10 masas solares evolucionen en enanas blancas.

Objetivo del estudio:

  • Para reportar el descubrimiento de una enana blanca inusual, SDSS J124043.01+671034.68.
  • Para caracterizar la composición atmosférica de esta enana blanca única e investigar sus implicaciones para la evolución estelar.

Principales métodos:

  • Análisis espectroscópico de la enana blanca SDSS J124043.01+671034.68.
  • Análisis de la composición de la atmósfera de la estrella para determinar la abundancia de elementos.

Principales resultados:

  • La enana blanca SDSS J124043.01+671034.68 exhibe una atmósfera compuesta casi en su totalidad de oxígeno.
  • El neón y el magnesio están presentes, pero en cantidades al menos 25 veces menores que el oxígeno.
  • No se detectó hidrógeno ni helio en la atmósfera de la estrella.

Conclusiones:

  • La composición atmosférica observada sugiere que esta enana blanca puede ser de tipo oxígeno-neón.
  • Este descubrimiento proporciona una prueba observacional rara para los modelos de evolución estelar, particularmente para las estrellas en el extremo de mayor masa de la formación de enanas blancas.