James, BL;
Tsamis, YG;
Barlow, MJ;
Westmoquette, MS;
Walsh, J;
Aloisi, A;
(2011)
Investigating the Chemical Homogeneity of Low-Metallicity Blue Compact Dwarf Galaxies Using Integral Field Spectroscopy.
EAS Publications Series
, 48
pp. 109-114.
10.1051/eas/1148024.
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Abstract
It has been claimed in the past that in low-metallicity Blue Compact Dwarf (BCDs) galaxies, the N/O value is independent of metallicity (O/H ratio), implying the need to invoke a primary production of nitrogen in intermediate-mass stars, in addition to the secondary nitrogen produced from the CNO cycle in high-mass stars. In order to better understand this controversial issue we undertook an integral field spectroscopic study of the nebular gas within a sample of BCDs previously thought to have anomalously high N/O values. Here we present the results of this study for 3 BCDs: two with anomalous N/O values (Mrk 996 and UM 420) and one with more normal N/O values (UM 462). We describe in detail how we derived the physical conditions (Te, Ne) as a function of position within the galaxy, and as a consequence, how this revealed both revised metallicities and normal N/O ratios and uncovered one of the first clear evidences of nitrogen self-enrichment of an H II region from WR stars.
| Type: | Article |
|---|---|
| Title: | Investigating the Chemical Homogeneity of Low-Metallicity Blue Compact Dwarf Galaxies Using Integral Field Spectroscopy |
| Event: | Conference on a Universe of Dwarf Galaxies |
| Location: | Univ Lyon 1, Lyon, FRANCE |
| Dates: | 14 June 2010 - 18 June 2010 |
| ISBN-13: | 978-2-7598-0662-1 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/eas/1148024 |
| Publisher version: | https://doi.org/10.1051/eas/1148024 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, VLT VIMOS, ABUNDANCES |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10096445 |
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