Cosmic variance in [O/Fe] in the Galactic disk
  • Metaadatok
Tartalom: http://real.mtak.hu/40873/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published

Type = Article
Cím:
Cosmic variance in [O/Fe] in the Galactic disk
Létrehozó:
Bertran de Lis, Sara
Mészáros, Szabolcs
Kiadó:
EDP Sciences
Dátum:
2016
Téma:
QB Astronomy, Astrophysics / csillagászat, asztrofizika
Tartalmi leírás:
We examine the distribution of the [O/Fe] abundance ratio in stars across the Galactic disk using H-band spectra from the Apache Point
Galactic Evolution Experiment (APOGEE). We minimize systematic errors by considering groups of stars with similar atmospheric
parameters. The APOGEE measurements in the Sloan Digital Sky Survey data release 12 reveal that the square root of the star-to-star
cosmic variance in the oxygen-to-iron ratio at a given metallicity is about 0.03–0.04 dex in both the thin and thick disk. This is about
twice as high as the spread found for solar twins in the immediate solar neighborhood and the di�erence is probably associated to the
wider range of galactocentric distances spanned by APOGEE stars.We quantify the uncertainties by examining the spread among stars
with the same parameters in clusters; these errors are a function of e�ective temperature and metallicity, ranging between 0.005 dex
at 4000 K and solar metallicity, to about 0.03 dex at 4500 K and [Fe=H] '
Nyelv:
magyar
Típus:
Article
PeerReviewed
info:eu-repo/semantics/article
Formátum:
text
Azonosító:
Bertran de Lis, Sara and Mészáros, Szabolcs (2016) Cosmic variance in [O/Fe] in the Galactic disk. Astronomy & Astrophysics, 590. pp. 1-6. ISSN 0004-6361
Kapcsolat: