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http://dbpedia.org/ontology/abstract DD del Llangardaix (DD Lacertae) és una esDD del Llangardaix (DD Lacertae) és una estrella a la constel·lació del Llangardaix, (Lacerta). Pertany a la Associació estel·lar Lac OB1, la distància respecte al Sistema Solar s'estima en 1.700 anys llum. Catalogada com gegant blau de tipus espectral B2III, DD del Llangardaix és un estel calent la temperatura efectiva és de 24.000 K. Té una lluminositat equivalent a 22.000 sols i una mida 8,5 vegades més gran que el del Sol. La seua metal·licitat és semblant a la de el Sol i posseeix una massa de 12,5 masses solars. Com correspon a un estel de les seves característiques, és molt més jove que el Sol, amb una edat compresa entre 11 i 23 milions d'anys. DD del Llangardaix és una variable Beta Cephei; en aquestes variables les fluctuacions de brillantor es produeixen per pulsacions en la superfície estel·lar. Així, la seva magnitud aparent oscil·la entre +5,16 i +5,28, sent el seu període principal de 2,917 dies. S'han identificat quatre maneres addicionals, amb períodes de 4,63, 4,50, 4,74 i 4,37 hores. Tot i que la mesura de la seva velocitat de rotació projectada és de 49 km/s, l'interior de l'estrella trota a una velocitat d'al menys 100 km / s.ota a una velocitat d'al menys 100 km / s. , 12 Lacertae is a wide binary star system i12 Lacertae is a wide binary star system in the northern constellation of Lacerta, located roughly 1,260 light years away from the Sun based on parallax. It is visible to the naked eye as a dim, blue-white hued point of light with a baseline apparent visual magnitude of 5.23. The system is drifting closer to the Earth with a mean heliocentric radial velocity of –12.5. It is a probable member of the I Lacertae OB association (Lac OB1). The primary component is a Beta Cephei variable with a stellar classification of B1.5III, matching a B-type star with the luminosity class of a giant star. It has been known to be variable for more than a century and has been extensively studied. The variable radial velocity of the star was discovered by W. S. Adams in 1912, and the light variations were established by 1919. The pulsational nature of the variability was shown by P. Ledoux in 1951, which led to one of the first world-wide observing campaigns with the star as its target. Dutch mathematician F. J. M. Barning analyzed the resulting data in 1963 and found four separate cycles of variation. By 1994, six periods had been confirmed. The variable star designation of the primary is DD Lacertae, while 12 Lacertae is the Flamsteed designation. In general terms it varies in magnitude from 5.16 down to 5.28 with a period of 4.63 hours. As many as eleven different frequencies have been detected, with the dominant cycle showing a frequency of 5.179034 cycles per day. Curiously, three of the frequencies form an equally-spaced triplet with cycles of 5.179, 5.334, and 5.490 per day, although this alignment appears to be a coincidence. It is a hybrid pulsator, showing mixed behaviors of a Beta Cephei variable and a slowly pulsating B-type star. The primary is a massive star, having 9.5 times the mass of the Sun and an age of only 22 million years old. It has about 8.4 times the girth of the Sun. The averaged quadratic field strength of the surface magnetic field is (2,352.3±1,604.9)×10−4 T. It is radiating 8,877 times the luminosity of the Sun from its photosphere at an effective temperature of 23,809 K. The estimated rotational velocity of the primary at the equator is 52±5 km/s; about 10% of its break-up velocity. However, seismic models suggest the core region is rotating much more rapidly with a rotational velocity of up to 100 km/s, and thus the star is undergoing differential rotation. The companion is an A-type main-sequence star with a stellar classification of A3V and visual magnitude 9.2. As of 2008, it had an angular separation of 69″ from the primary. There is a faint infrared nebulosity at a separation of 0.6 light-years from the pair that is most likely a bow shock. the pair that is most likely a bow shock. , DD Lacertae (DD Lac / 12 Lacertae / HD 214DD Lacertae (DD Lac / 12 Lacertae / HD 214993 / HR 8640) es una estrella en la constelación de Lacerta, el lagarto. Pertenece a la Asociación estelar Lac OB1, cuya distancia respecto al Sistema Solar se estima en 1700 años luz.​ Catalogada como gigante azul de tipo espectral B2III,​ DD Lacertae es una estrella caliente cuya temperatura efectiva es de 24.000 K. Tiene una luminosidad equivalente a 22.000 soles y un tamaño 8,5 veces mayor que el del Sol.Su metalicidad es semejante a la del Sol y posee una masa de 12,5 masas solares. Como corresponde a una estrella de sus características, es mucho más joven que el Sol, con una edad comprendida entre 11 y 23 millones de años.​ DD Lacertae es una variable Beta Cephei; en estas variables las fluctuaciones de brillo se producen por pulsaciones en la superficie estelar. Así, su magnitud aparente oscila entre +5,16 y +5,28, siendo su período principal de 2,917 días. Se han identificado otros cuatro modos adicionales, con períodos de 4,63, 4,50, 4,74 y 4,37 horas.Aunque la medida de su velocidad de rotación proyectada es de 49 km/s, el interior de la estrella rota a una velocidad de al menos 100 km/s.​ota a una velocidad de al menos 100 km/s.​ , 蝎虎座12(车府增十二),又名BD+39 4912,HD 214993、SAO 72627、HR 8640,是蝎虎座的一颗恒星,视星等为5.25,位于銀經97.65,銀緯-16.18,其B1900.0坐标为赤經22h 36m 59.9s,赤緯+39° -16.18′ 11″。 , 12 Lacertae è una stella della costellazio12 Lacertae è una stella della costellazione della Lucertola, situata nella parte meridionale della costellazione. È una variabile beta Cephei, con oscillazioni di magnitudine fra 5,16 e 5,28. Sono riportati in letteratura ben 6 periodi secondari di oscillazioni di magnitudine, compresi fra 0,095109 giorni e 0,23583 giorni. È anche una binaria spettroscopica, nota come S 815; la sua compagna è di magnitudine 9,2, classe spettrale A3 V, separata dalla primaria da 69 secondi d'arco, con un angolo di posizione di 16°, misurata in 7 osservazioni fra il 1825 e il 1925.a in 7 osservazioni fra il 1825 e il 1925. , 12 Lacertae, som är stjärnans Flamsteed-be12 Lacertae, som är stjärnans Flamsteed-beteckning, är en vid dubbelstjärna belägen i den södra delen av stjärnbilden Ödlan, som också har variabelbeteckningen DD Lacertae. Den har en genomsnittlig skenbar magnitud på ca 5,23 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 3,1 mas, beräknas den befinna sig på ett avstånd på ca 1 050 ljusår (ca 320 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -13 km/s och ingår troligen i stjärnföreningen I Lacertae OB (Lac OB1). stjärnföreningen I Lacertae OB (Lac OB1).
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rdfs:comment DD Lacertae (DD Lac / 12 Lacertae / HD 214993 / HR 8640) es una estrella en la constelación de Lacerta, el lagarto. Pertenece a la Asociación estelar Lac OB1, cuya distancia respecto al Sistema Solar se estima en 1700 años luz.​ , DD del Llangardaix (DD Lacertae) és una estrella a la constel·lació del Llangardaix, (Lacerta). Pertany a la Associació estel·lar Lac OB1, la distància respecte al Sistema Solar s'estima en 1.700 anys llum. , 12 Lacertae is a wide binary star system i12 Lacertae is a wide binary star system in the northern constellation of Lacerta, located roughly 1,260 light years away from the Sun based on parallax. It is visible to the naked eye as a dim, blue-white hued point of light with a baseline apparent visual magnitude of 5.23. The system is drifting closer to the Earth with a mean heliocentric radial velocity of –12.5. It is a probable member of the I Lacertae OB association (Lac OB1).f the I Lacertae OB association (Lac OB1). , 12 Lacertae è una stella della costellazio12 Lacertae è una stella della costellazione della Lucertola, situata nella parte meridionale della costellazione. È una variabile beta Cephei, con oscillazioni di magnitudine fra 5,16 e 5,28. Sono riportati in letteratura ben 6 periodi secondari di oscillazioni di magnitudine, compresi fra 0,095109 giorni e 0,23583 giorni. È anche una binaria spettroscopica, nota come S 815; la sua compagna è di magnitudine 9,2, classe spettrale A3 V, separata dalla primaria da 69 secondi d'arco, con un angolo di posizione di 16°, misurata in 7 osservazioni fra il 1825 e il 1925.a in 7 osservazioni fra il 1825 e il 1925. , 12 Lacertae, som är stjärnans Flamsteed-be12 Lacertae, som är stjärnans Flamsteed-beteckning, är en vid dubbelstjärna belägen i den södra delen av stjärnbilden Ödlan, som också har variabelbeteckningen DD Lacertae. Den har en genomsnittlig skenbar magnitud på ca 5,23 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 3,1 mas, beräknas den befinna sig på ett avstånd på ca 1 050 ljusår (ca 320 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -13 km/s och ingår troligen i stjärnföreningen I Lacertae OB (Lac OB1). stjärnföreningen I Lacertae OB (Lac OB1). , 蝎虎座12(车府增十二),又名BD+39 4912,HD 214993、SAO 72627、HR 8640,是蝎虎座的一颗恒星,视星等为5.25,位于銀經97.65,銀緯-16.18,其B1900.0坐标为赤經22h 36m 59.9s,赤緯+39° -16.18′ 11″。
rdfs:label DD Lacertae , 12 Lacertae , DD del Llangardaix , 车府增十二
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