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- Q491497 subject Q10644.
- Q491497 subject Q10814031.
- Q491497 subject Q6808782.
- Q491497 abstract "SDSS J102915+172927 or Caffau's star is a population II star in the galactic halo, seen in the constellation Leo. It is about 13 billion years old, making it one of the oldest stars in the Galaxy. At the time of its discovery, it had the lowest metallicity of any known star. It is small (less than 0.8 solar masses), deficient in carbon, nitrogen, oxygen, and completely devoid of lithium. Because carbon and oxygen provide a fine structure cooling mechanism that is critical in the formation of low-mass stars, the origins of Caffau's star are somewhat mysterious. It has been suggested, both for theoretical and observational reasons, that the formation of low-mass stars in the interstellar medium requires a critical metallicity somewhere between 1.5×10−8 and 1.5×10−6. The metallicity of Caffau's star is less than 6.9×10−7. According to Schneider et al., cooling by dust rather than the fine structure lines of CII and OI may have enabled the creation of such low-mass, metal-poor stars in the early universe. The absence of lithium implies past temperatures of at least two million Kelvins.The star was described by Elisabetta Caffau et al. in an article published by the journal Nature in September 2011. Caffau had been searching for extremely metal-poor stars for the past ten years. It was identified by automated software which analyzed data from the Sloan Digital Sky Survey. This was followed up by observations with the X-shooter and UVES instruments on the Very Large Telescope in Chile. Caffau and her team expect to find between five and fifty similar stars with the telescope in the future.".
- Q491497 thumbnail SDSS_J102915_172927.jpg?width=300.
- Q491497 wikiPageWikiLink Q10644.
- Q491497 wikiPageWikiLink Q10814031.
- Q491497 wikiPageWikiLink Q1195248.
- Q491497 wikiPageWikiLink Q1331092.
- Q491497 wikiPageWikiLink Q180445.
- Q491497 wikiPageWikiLink Q180892.
- Q491497 wikiPageWikiLink Q217030.
- Q491497 wikiPageWikiLink Q265628.
- Q491497 wikiPageWikiLink Q2703.
- Q491497 wikiPageWikiLink Q41872.
- Q491497 wikiPageWikiLink Q471702.
- Q491497 wikiPageWikiLink Q523.
- Q491497 wikiPageWikiLink Q568.
- Q491497 wikiPageWikiLink Q623.
- Q491497 wikiPageWikiLink Q627.
- Q491497 wikiPageWikiLink Q629.
- Q491497 wikiPageWikiLink Q631379.
- Q491497 wikiPageWikiLink Q6808782.
- Q491497 wikiPageWikiLink Q796883.
- Q491497 wikiPageWikiLink Q840332.
- Q491497 wikiPageWikiLink Q8853.
- Q491497 wikiPageWikiLink Q922682.
- Q491497 type Place.
- Q491497 type CelestialBody.
- Q491497 type Location.
- Q491497 type Place.
- Q491497 type Star.
- Q491497 type Thing.
- Q491497 comment "SDSS J102915+172927 or Caffau's star is a population II star in the galactic halo, seen in the constellation Leo. It is about 13 billion years old, making it one of the oldest stars in the Galaxy. At the time of its discovery, it had the lowest metallicity of any known star. It is small (less than 0.8 solar masses), deficient in carbon, nitrogen, oxygen, and completely devoid of lithium.".
- Q491497 label "SDSS J102915+172927".
- Q491497 depiction SDSS_J102915_172927.jpg.
- Q491497 name "SDSS J102915+172927".