A new sample of extremely/ultra metal-poor stars

dc.contributor.authorGarcia Perez, A E
dc.contributor.authorChristlieb, N
dc.contributor.authorRyan, Sean G
dc.contributor.authorBeers, Timothy C
dc.contributor.authorAoki, Wako
dc.contributor.authorAsplund, Martin
dc.contributor.authorBarklem, Paul S
dc.contributor.authorBessell, Michael
dc.contributor.authorEriksson, Kjell
dc.contributor.authorFrebel, Anna
dc.contributor.authorGustafsson, Bengt
dc.contributor.authorKorn, A J
dc.contributor.authorNordstrom, B
dc.contributor.authorNorris, John
dc.coverage.spatialUppsala Sweden
dc.date.accessioned2015-12-08T22:25:40Z
dc.date.createdJune 23-27 2008
dc.date.issued2008
dc.date.updated2016-02-24T11:05:55Z
dc.description.abstractA sample of 30 very metal-poor stars from the Hamburg-European Southern Observatory (ESO) objective-prism survey have been observed at high spectral resolution at the Very Large Telescope (VLT) using the Ultraviolet and Visual Echelle Spectrograph (UVES). Two of the observed stars are very interesting not only because of their very low iron content, approximately four orders of magnitude lower than the solar value, but also because we detected the neutral lithium resonance line at 670.8 nm. Hydrogen lines suggest that the two observed stars have effective temperatures around 6000-6250 K and according to isochrones, they are either on the main-sequence or on the subgiant branch, in which case they would probably be the most metal-poor dwarfs or warm subgiants with lithium detections known. These detections would allow to determine more accurately the slope of the trend of the lithium abundance with [Fe/H] than was possible with samples of unevolved stars restricted to higher metallicities.
dc.identifier.urihttp://hdl.handle.net/1885/33534
dc.publisherIOP Publishing
dc.relation.ispartofseriesA Stellar Journey: A symposium in Celebration of Bengt Gustafsson's 65th Birthday
dc.sourcePhysica Scripta, Volume T133
dc.source.urihttp://iopscience.iop.org/1402-4896/2008/T133
dc.subjectKeywords: Echelle spectrograph; Effective temperature; European Southern Observatory; Four-order; High spectral resolution; Hydrogen lines; Iron content; Isochrones; Metal-poor star; Metallicities; Neutral lithium; Subgiants; Very large telescope; Lithium; Optical
dc.titleA new sample of extremely/ultra metal-poor stars
dc.typeConference paper
local.bibliographicCitation.startpage014036
local.contributor.affiliationGarcia Perez, A E, Uppsala Astronomical Observatory
local.contributor.affiliationChristlieb, N, University of Heidelberg
local.contributor.affiliationRyan, Sean G, Centre for Astrophysics Research
local.contributor.affiliationBeers, Timothy C, Michigan State University
local.contributor.affiliationAoki, Wako, National Astronomical Observatory of Japan
local.contributor.affiliationAsplund, Martin, Max Planck Institute for Astrophysics
local.contributor.affiliationBarklem, Paul S, Uppsala Astronomical Observatory
local.contributor.affiliationBessell, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationEriksson, Kjell, Uppsala Astronomical Observatory
local.contributor.affiliationFrebel, Anna, University of Texas
local.contributor.affiliationGustafsson, Bengt, Uppsala Astronomical Observatory
local.contributor.affiliationKorn, A J, Uppsala Astronomical Observatory
local.contributor.affiliationNordstrom, B, Copenhagen University
local.contributor.affiliationNorris, John, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailu6900904@anu.edu.au
local.contributor.authoruidBessell, Michael, u6900904
local.contributor.authoruidNorris, John, u7401084
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu4362859xPUB103
local.identifier.ariespublicationu4630950xPUB107
local.identifier.doi10.1088/0031-8949/2008/T133/014036
local.identifier.scopusID2-s2.0-70350654387
local.identifier.thomsonID000262583700038
local.identifier.uidSubmittedByu4362859
local.type.statusPublished Version

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
01_Garcia Perez_A_new_sample_of_2008.pdf
Size:
365.25 KB
Format:
Adobe Portable Document Format