English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
 Local TagsRelease HistoryDetailsSummary
  Chemical analysis of very metal-poor turn-off stars from SDSS-DR12

François, P., Caffau, E., Wanajo, S., Aguado, D., Spite, M., Aoki, M., et al. (2018). Chemical analysis of very metal-poor turn-off stars from SDSS-DR12. Astronomy and Astrophysics, 619.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CDB6-7 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CDB7-6
Genre: Journal Article

Files

show Files

Locators

show
hide
Locator:
https://ui.adsabs.harvard.edu/abs/2018A&A...619A..10F (Any fulltext)
Description:
-
OA-Status:

Creators

show
hide
 Creators:
François, P.1, Author
Caffau, E.1, Author
Wanajo, S.1, Author
Aguado, D.1, Author
Spite, M.1, Author
Aoki, M.1, Author
Aoki, W.1, Author
Bonifacio, P.1, Author
Gallagher, A. J.1, Author
Salvadori, S.1, Author
Spite, F.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Content

show
hide
Free keywords: stars: Population II Galaxy: abundances Galaxy: halo Astrophysics - Astrophysics of Galaxies Astrophysics - Solar and Stellar Astrophysics
 Abstract: Context. The most metal-poor stars are the relics of the early chemical evolution of the Galaxy. Their chemical composition is an important tool to constrain the nucleosynthesis in the first generation of stars. The aim is to observe a sample of extremely metal-poor star (EMP stars) candidates selected from the Sloan Digital Sky Survey Data Release 12 (SDSS DR12) and determine their chemical composition.
Aims: We obtain medium resolution spectra of a sample of six stars using the X-shooter spectrograph at the Very Large Telescope (VLT) and we used ATLAS models to compute the abundances.
Methods: Five stars of the sample have a metallicity [Fe/H] between -2.5 dex and -3.2 dex. We confirm the recent discovery of SDSS J002314.00+030758.0 as a star with an extremely low [Fe/H] ratio. Assuming the α-enhancement [Ca/Fe] = +0.4 dex, we obtain [Fe/H] = -6.1 dex.
Results: We could also determine its magnesium abundance and found that this star exhibits a very high ratio [Mg/Fe]≤ +3.60 dex assuming [Fe/H] = -6.13 dex. We determined the carbon abundance and found A(C) = 6.4 dex. From this carbon abundance, this stars belongs to the lower band of the A(C)-[Fe/H] diagram. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme ID 099.D-0576(A).

Details

show
hide
Language(s):
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomy and Astrophysics
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 619 Sequence Number: - Start / End Page: - Identifier: -