SDSS J1240+6710 or SDSS J124043.01+671034.68, nicknamed Dox by its discoverers, is a white dwarf in the constellation Draco. It was discovered by Kepler de Souza Oliveira, Detlev Koester and Gustavo Ourique. It is unusual for having an atmosphere of almost pure oxygen. The atmosphere also has a detectable amount of magnesium, neon (under 4%) and silicon, but no hydrogen, helium or carbon. A possible explanation for the unusual composition would be if its mass were close to the limit for collapsing to a neutron star. But its mass is only 0.56 solar masses, below the mass expected for a star that could convert carbon to oxygen, neon and magnesium.
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| - SDSSJ1240+6710 (in)
- SDSS J124043.01+671034.68 (fr)
- SDSS J1240+6710 (en)
- SDSS J1240+6710 (sv)
- SDSS J1240+6710 (zh)
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| - SDSS J124043.01+671034.68, souvent abrégé en SDSS J1240+6710 et surnommée Dox par ses codécouvreurs, est une naine blanche, la première (et seule à ce jour, en 2016) connue dont l'atmosphère est essentiellement constituée d'oxygène. (fr)
- SDSSJ1240+6710 atau SDSS J124043.01+671034.68, adalah bintang katai putih yang memiliki atmosfer berupa oksigen hampir murni. Atmosfernya juga terdeteksi mengandung magnesium, neon (dibawah 4%) dan silikon, tetapi tidak ditemukan adanya hidrogen atau helium. (in)
- SDSS J1240+6710，全稱SDSS J124043.01+671034.68，暱稱Dox，是一顆大氣層幾乎全由氧組成的白矮星。該顆白矮星由、德特列夫·凱斯特（Detlev Koester）與古斯塔沃·奧里基（Gustavo Ourique）發現。 (zh)
- SDSS J1240+6710 or SDSS J124043.01+671034.68, nicknamed Dox by its discoverers, is a white dwarf in the constellation Draco. It was discovered by Kepler de Souza Oliveira, Detlev Koester and Gustavo Ourique. It is unusual for having an atmosphere of almost pure oxygen. The atmosphere also has a detectable amount of magnesium, neon (under 4%) and silicon, but no hydrogen, helium or carbon. A possible explanation for the unusual composition would be if its mass were close to the limit for collapsing to a neutron star. But its mass is only 0.56 solar masses, below the mass expected for a star that could convert carbon to oxygen, neon and magnesium. (en)
- SDSS J1240+6710, eller SDSS J124043.01+671034.68, även kallad Dox, är en vit dvärgstjärna. Den upptäcktes av Sloan Digital Sky Survey (SDSS) 2016 och väckte stort uppseende bland astronomerna eftersom dess atmosfär bestod av så gott som uteslutande syre, 99,9 procent. Neon och magnesium är de näst vanligaste grundämnen hos stjärnan, med bråkdelar av procent. Med denna sammansättning är stjärnan unik bland de 32000 vita dvärgar som astronomerna har uppgifter om kemisk sammansättning. Det är också den enda kända stjärnan med en atmosfär av rent syre. (sv)
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| - SDSS J124043.01+671034.68, souvent abrégé en SDSS J1240+6710 et surnommée Dox par ses codécouvreurs, est une naine blanche, la première (et seule à ce jour, en 2016) connue dont l'atmosphère est essentiellement constituée d'oxygène. (fr)
- SDSSJ1240+6710 atau SDSS J124043.01+671034.68, adalah bintang katai putih yang memiliki atmosfer berupa oksigen hampir murni. Atmosfernya juga terdeteksi mengandung magnesium, neon (dibawah 4%) dan silikon, tetapi tidak ditemukan adanya hidrogen atau helium. (in)
- SDSS J1240+6710 or SDSS J124043.01+671034.68, nicknamed Dox by its discoverers, is a white dwarf in the constellation Draco. It was discovered by Kepler de Souza Oliveira, Detlev Koester and Gustavo Ourique. It is unusual for having an atmosphere of almost pure oxygen. The atmosphere also has a detectable amount of magnesium, neon (under 4%) and silicon, but no hydrogen, helium or carbon. A possible explanation for the unusual composition would be if its mass were close to the limit for collapsing to a neutron star. But its mass is only 0.56 solar masses, below the mass expected for a star that could convert carbon to oxygen, neon and magnesium. The star was originally catalogued in the catalogue of new white dwarf stars from the Data Release 12 of the Sloan Digital Sky Survey. Gustavo Ourique, an undergraduate in Physics at Universidade Federal do Rio Grande do Sul, identified the star's unique spectrum, working under the advice of Dr. Kepler Oliveira (S.O. Kepler). The star's spectrum was modeled by Dr. Detlev Koester, characterizing its composition, temperature and mass. In 2020, the star was discovered to be moving at an unusually high velocity. There is no fully-confirmed explanation for this. There are various theories put forth as to possible reasons for this. Some researchers indicate this may be due to a supernova that has not been observed yet, and which would cause this star to move at high velocities. However, there is no definitive data that can absolutely prove that this is what happened. Astronomers note that some supernovas are difficult to detect, especially if they do not contain the element nickel, which is a key indicator for such events. (en)
- SDSS J1240+6710, eller SDSS J124043.01+671034.68, även kallad Dox, är en vit dvärgstjärna. Den upptäcktes av Sloan Digital Sky Survey (SDSS) 2016 och väckte stort uppseende bland astronomerna eftersom dess atmosfär bestod av så gott som uteslutande syre, 99,9 procent. Neon och magnesium är de näst vanligaste grundämnen hos stjärnan, med bråkdelar av procent. Med denna sammansättning är stjärnan unik bland de 32000 vita dvärgar som astronomerna har uppgifter om kemisk sammansättning. Det är också den enda kända stjärnan med en atmosfär av rent syre. SDSS J1240+6710 upptäcktes i stjärnbilden Draken och befinner sig på ungefär 1200 ljusårs avstånd från solsystemet. (sv)
- SDSS J1240+6710，全稱SDSS J124043.01+671034.68，暱稱Dox，是一顆大氣層幾乎全由氧組成的白矮星。該顆白矮星由、德特列夫·凱斯特（Detlev Koester）與古斯塔沃·奧里基（Gustavo Ourique）發現。 (zh)
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