Search: onr:"swepub:oai:DiVA.org:uu-144943" >
Discovery of HE 152...
Discovery of HE 1523-0901, a strongly r-process-enhanced metal-poor star with detected uranium
-
Frebel, Anna (author)
-
- Christlieb, Norbert (author)
- Uppsala universitet,Institutionen för astronomi och rymdfysik
-
Norris, John E. (author)
-
show more...
-
Thom, Christopher (author)
-
Beers, Timothy C. (author)
-
Rhee, Jaehyon (author)
-
show less...
-
(creator_code:org_t)
- 2007
- 2007
- English.
-
In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 660:2, s. L117-L120
- Related links:
-
https://urn.kb.se/re...
Abstract
Subject headings
Close
- We present age estimates for the newly discovered, very r-process-enhanced metal-poor star HE 1523 - 0901 ([Fe/H] = -2.95) based on the radioactive decay of Th and U. The bright (V = 11.1) giant was found among a sample of bright metal-poor stars selected from the Hamburg/ESO Survey. From an abundance analysis of a high-resolution (R = 75,000) VLT/UVES spectrum, we find HE 1523 - 0901 to be strongly overabundant in r- process elements ([r/Fe] = 1.8). The abundances of heavy neutron-capture elements (Z > 56) measured in HE 1523 - 0901 match the scaled solar r- process pattern extremely well. We detect the strongest optical U line at 3859.57 angstrom. For the first time, we are able to employ several different chronometers, such as the U/Th, U/Ir, Th/ Eu, and Th/Os ratios to measure the age of a star. The weighted average age of HE 1523 - 0901 is 13.2 Gyr. Several sources of uncertainties are assessed in detail.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- early universe
- Galaxy : halo
- nuclear reactions
- nucleosynthesis
- abundances
- stars : abundances
- stars : individual (HE 1523-0901)
- Physics
- Fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database