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- BD_+17°_3248 abstract "BD +17° 3248 is an old Population II star located at a distance of roughly 968 light-years (297 parsecs) in the Galactic Halo. It belongs to the class of ultra-metal-poor stars, especially the very rare subclass of neutron-capture (r-process) enhanced stars.Since about 2000, this star had been studied with 3 telescopes: a) the Hubble Space Telescope, b) the Keck I telescope and c) the Harlan J. Smith Telescope at the McDonald Observatory of the University of Texas. Elemental abundances in the range from germanium (Z=32) up to Uranium (Z=92) were determined. The Hubble Space Telescope was used to observe the ultraviolet part of the stellar spectra. This allowed the measurement of platinum, osmium and, for the first time outside of the Solar System, gold. From barium (Z=56) onward, all elements show a pattern of r-process contribution to the abundances of the elements in the Solar system.The University of Mainz and University of Basel groups of Karl-Ludwig Kratz and Friedrich-Karl Thielemann performed a comparison between the observed abundances for the stable element europium (Z=63) and the radioactive elements thorium (Z=90) and uranium (Z=92) to the calculated abundances of an r-process in a Type II supernova explosion. This allowed the age of this star to be estimated as about 13.8 billion years with an uncertainty of 4 billion years. A similar age was derived for another ultra-metal-poor star (CS31082-001 from Thorium to uranium ratios. These stars were born several hundred million years after the Big Bang.".
- BD_+17°_3248 wikiPageID "4811261".
- BD_+17°_3248 wikiPageRevisionID "587300793".
- BD_+17°_3248 absmagV "+2.16".
- BD_+17°_3248 ageGyr "13.8".
- BD_+17°_3248 appmagV "9.37".
- BD_+17°_3248 bV "+0.66".
- BD_+17°_3248 class "KII vw".
- BD_+17°_3248 constell Hercules_(constellation).
- BD_+17°_3248 epoch "J2000".
- BD_+17°_3248 gravity "2.3".
- BD_+17°_3248 mass "0.55".
- BD_+17°_3248 metalFe "–2.02".
- BD_+17°_3248 pError "1.77".
- BD_+17°_3248 parallax "3.37".
- BD_+17°_3248 propMoDec "–23.51".
- BD_+17°_3248 propMoRa "–46.61".
- BD_+17°_3248 radialV "–146.55".
- BD_+17°_3248 uB "+0.08".
- BD_+17°_3248 subject Category:Durchmusterung_objects.
- BD_+17°_3248 subject Category:Hercules_(constellation).
- BD_+17°_3248 subject Category:K-type_bright_giants.
- BD_+17°_3248 subject Category:Population_II_stars.
- BD_+17°_3248 type CelestialBody.
- BD_+17°_3248 type Star.
- BD_+17°_3248 type PhysicalBody.
- BD_+17°_3248 comment "BD +17° 3248 is an old Population II star located at a distance of roughly 968 light-years (297 parsecs) in the Galactic Halo. It belongs to the class of ultra-metal-poor stars, especially the very rare subclass of neutron-capture (r-process) enhanced stars.Since about 2000, this star had been studied with 3 telescopes: a) the Hubble Space Telescope, b) the Keck I telescope and c) the Harlan J. Smith Telescope at the McDonald Observatory of the University of Texas.".
- BD_+17°_3248 label "BD +17° 3248".
- BD_+17°_3248 label "BD +17° 3248".
- BD_+17°_3248 sameAs BD_+17%C2%B0_3248.
- BD_+17°_3248 sameAs BD_+17°_3248.
- BD_+17°_3248 sameAs Q795778.
- BD_+17°_3248 sameAs Q795778.
- BD_+17°_3248 wasDerivedFrom BD_+17°_3248?oldid=587300793.