G 117-B15A (original) (raw)
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
| Property | Value |
|---|---|
| dbo:abstract | 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) |
| dbo:thumbnail | wiki-commons:Special:FilePath/RYLMiLightCurve.png?width=300 |
| dbo:wikiPageID | 11633574 (xsd:integer) |
| dbo:wikiPageLength | 6171 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1065931465 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Ross_548 dbr:Light_curve dbc:Astronomical_X-ray_sources dbc:Leo_Minor dbc:Objects_with_variable_star_designations dbr:Constellation dbr:Leo_Minor dbr:Star dbr:White_dwarf dbr:DAV_star dbr:Gravity_wave dbc:X-ray_astronomy dbr:Asteroseismology dbr:International_Celestial_Reference_System dbr:J2000.0 dbc:Pulsating_white_dwarfs dbr:Atomic_clock dbr:Variable_star dbr:Leo_Minor_(constellation) dbr:File:RYLMiLightCurve.png |
| dbp:appmagV | 15.500000 (xsd:double) |
| dbp:bV | 0.200000 (xsd:double) |
| dbp:class | DAV4 (en) |
| dbp:constell | dbr:Leo_Minor_(constellation) |
| dbp:epoch | J2000.0 (en) |
| dbp:propMoDec | 22 (xsd:integer) |
| dbp:propMoRa | -136 (xsd:integer) |
| dbp:uB | -0.600000 (xsd:double) |
| dbp:variable | dbr:DAV_star |
| dbp:wikiPageUsesTemplate | dbt:Reflist dbt:Short_description dbt:Starbox_astrometry dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_image dbt:Starbox_observe dbt:Starbox_reference dbt:Stars_of_Leo_Minor dbt:Val dbt:DEC dbt:Odlist dbt:RA |
| dcterms:subject | dbc:Astronomical_X-ray_sources dbc:Leo_Minor dbc:Objects_with_variable_star_designations dbc:X-ray_astronomy dbc:Pulsating_white_dwarfs |
| gold:hypernym | dbr:Star |
| rdf:type | owl:Thing dbo:Place dbo:Location schema:Place dbo:CelestialBody yago:WikicatVariableStars yago:WikicatWhiteDwarfs yago:WikicatObjectsNamedWithVariableStarDesignations yago:WikicatStars yago:CelestialBody109239740 yago:NaturalObject100019128 yago:Object100002684 yago:PhysicalEntity100001930 dbo:Star yago:Star109444100 yago:VariableStar109469152 yago:WhiteDwarf109478569 yago:Whole100003553 yago:WikicatPulsatingWhiteDwarfs |
| rdfs:comment | 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) |
| rdfs:label | RY Leonis Minoris (es) G 117-B15A (en) |
| owl:sameAs | freebase:G 117-B15A yago-res:G 117-B15A wikidata:G 117-B15A http://ast.dbpedia.org/resource/RY_Leonis_Minoris dbpedia-es:G 117-B15A dbpedia-fa:G 117-B15A https://global.dbpedia.org/id/4iLj3 |
| prov:wasDerivedFrom | wikipedia-en:G_117-B15A?oldid=1065931465&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/RYLMiLightCurve.png |
| foaf:isPrimaryTopicOf | wikipedia-en:G_117-B15A |
| foaf:name | G 117-B15A (en) |
| is dbo:wikiPageRedirects of | dbr:G117-B15A dbr:RY_Leo_Minoris |
| is dbo:wikiPageWikiLink of | dbr:Pulsating_white_dwarf dbr:Leo_Minor dbr:List_of_stars_in_Leo_Minor dbr:G117-B15A dbr:RY_Leo_Minoris |
| is foaf:primaryTopic of | wikipedia-en:G_117-B15A |
