SIMBAD references

2004A&A...421..649I - Astronomy and Astrophysics, volume 421, 649-658 (2004/7-2)

Galactic evolution of nitrogen.

ISRAELIAN G., ECUVILLON A., REBOLO R., GARCIA-LOPEZ R., BONIFACIO P. and MOLARO P.

Abstract (from CDS):

We present detailed spectroscopic analysis of nitrogen abundances in 31 unevolved metal-poor stars analysed by spectral synthesis of the near-UV NH band at 3360 Å observed at high resolution with various telescopes. We found that [N/Fe] scales with that of iron in the metallicity range -3.1<[Fe/H]<0 with the slope 0.01±0.02. Furthermore, we derive uniform and accurate (N/O) ratios using oxygen abundances from near-UV OH lines obtained in our previous studies. We find that a primary component of nitrogen is required to explain the observations. The NH lines are discovered in the VLT/UVES spectra of the very metal-poor subdwarfs G64-12 and LP815-43 indicating that these stars are N rich. The results are compared with theoretical models and observations of extragalactic HII regions and Damped Lyα systems. This is the first direct comparison of the (N/O) ratios in these objects with those in Galactic stars.

Abstract Copyright:

Journal keyword(s): stars: abundances - galaxies: abundances

Simbad objects: 46

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2004A&A...421..649I and select 'bookmark this link' or equivalent in the popup menu


2019.09.16-05:03:23

© Université de Strasbourg/CNRS

    • Contact