The Abundance Properties of Nearby Late-type Galaxies. I. The Data
Abstract
We investigate the oxygen and nitrogen abundance distributions across the optical disks of 130 nearby late-type galaxies using around 3740 published spectra of H II regions. We use these data in order to provide homogeneous abundance determinations for all objects in the sample, including H II regions in which not all of the usual diagnostic lines were measured. Examining the relation between N and O abundances in these galaxies we find that the abundances in their centers and at their isophotal R 25 disk radii follow the same relation. The variation in N/H at a given O/H is around 0.3 dex. We suggest that the observed spread in N/H may be partly caused by the time delay between N and O enrichment and the different star formation histories in galaxies of different morphological types and dimensions. We study the correlations between the abundance properties (central O and N abundances, radial O and N gradients) of a galaxy and its morphological type and dimension.
- Publication:
-
The Astronomical Journal
- Pub Date:
- June 2014
- DOI:
- 10.1088/0004-6256/147/6/131
- arXiv:
- arXiv:1403.5461
- Bibcode:
- 2014AJ....147..131P
- Keywords:
-
- galaxies: abundances;
- galaxies: irregular;
- galaxies: ISM;
- galaxies: spiral;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 77 pages, 6 figures, 3 tables, accepted to the AJ