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G117-B15A is a small, well-observed variable white dwarf star of the DAV, or ZZ Ceti, type in the constellation of Leo Minor. G117-B15A was found to be variable in 1974 by Richer and Ulrych, and this was confirmed in 1976 by McGraw and Robinson. In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations. As a consequence, its timescale for period change is directly proportional to its cooling timescale, allowing its cooling rate to be measured using astroseismological techniques. Its age is estimated at 400 million years. Its light curve has a dominant period of 215.2 seconds, which is estimated to increase by approximately one second each 14 million years. G117-B15A has been claimed to be the most stable optical clock ever found, much more stable t

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rdfs:label
  • RY Leonis Minoris (es)
  • G 117-B15A (en)
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  • G117-B15A is a small, well-observed variable white dwarf star of the DAV, or ZZ Ceti, type in the constellation of Leo Minor. G117-B15A was found to be variable in 1974 by Richer and Ulrych, and this was confirmed in 1976 by McGraw and Robinson. In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations. As a consequence, its timescale for period change is directly proportional to its cooling timescale, allowing its cooling rate to be measured using astroseismological techniques. Its age is estimated at 400 million years. Its light curve has a dominant period of 215.2 seconds, which is estimated to increase by approximately one second each 14 million years. G117-B15A has been claimed to be the most stable optical clock ever found, much more stable t (en)
  • RY Leonis Minoris (RY LMi / G 117-15A / WD 0921+354)​ es una enana blanca situada en la constelación de Leo Minor a 150 años luz de distancia del Sistema Solar.​ Con una edad estimada de 400 millones de años,​ tiene una temperatura efectiva entre 11.600 y 12.400 K.​ (es)
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  • G 117-B15A (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/RYLMiLightCurve.png
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  • DAV4 (en)
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  • J2000.0 (en)
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  • RY Leonis Minoris (RY LMi / G 117-15A / WD 0921+354)​ es una enana blanca situada en la constelación de Leo Minor a 150 años luz de distancia del Sistema Solar.​ Con una edad estimada de 400 millones de años,​ tiene una temperatura efectiva entre 11.600 y 12.400 K.​ RY Leonis Minoris es una enana blanca pulsante DAV o variable ZZ Ceti. Su variabilidad fue descubierta en 1974 por Richer y Ulrych,​ siendo confirmada en 1976 por McGraw y Robinson.​ En 1984 se demostró que la variabilidad de la estrella es debida a las pulsaciones no radiales de ondas de gravedad. Por consiguiente, su cambio de período a lo largo del tiempo es directamente proporcional a su enfriamiento con el tiempo, permitiendo que su ritmo de enfriamiento pueda ser medido mediante técnicas de astrosismología.​ Su curva de luz tiene un período dominante de 215,2 segundos estable en amplitud y fase,​ que se estima que aumenta aproximadamente un segundo cada 14 millones de años.​ Por ello, se ha afirmado que RY Leonis es el reloj óptico más estable encontrado nunca, cuyas señales son mucho más estables que las de un reloj atómico.​ (es)
  • G117-B15A is a small, well-observed variable white dwarf star of the DAV, or ZZ Ceti, type in the constellation of Leo Minor. G117-B15A was found to be variable in 1974 by Richer and Ulrych, and this was confirmed in 1976 by McGraw and Robinson. In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations. As a consequence, its timescale for period change is directly proportional to its cooling timescale, allowing its cooling rate to be measured using astroseismological techniques. Its age is estimated at 400 million years. Its light curve has a dominant period of 215.2 seconds, which is estimated to increase by approximately one second each 14 million years. G117-B15A has been claimed to be the most stable optical clock ever found, much more stable than the ticks of an atomic clock. It is also the first pulsating white dwarf to have its main pulsation mode index identified. (en)
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