Distributions, equivalent widths and metallicities of the regions in the spiral galaxies NGC 5457 and NGC 4395

Free access article

Issue		A&A Volume 391, Number 3, September I 2002


Page(s)		809 - 821
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20020588

A&A 391, 809-821 (2002)
DOI: 10.1051/0004-6361:20020588

Distributions, equivalent widths and metallicities of the $\ion{H}{II}$ regions in the spiral galaxies NGC 5457 and NGC 4395

B. Cedrés¹ and J. Cepa^{1, 2}

¹ Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
² Departamento de Astrofísica, Facultad de Física, Universidad de La Laguna, 38071 La Laguna, Tenerife, Spain

(Received 19 November 2001 / Accepted 16 April 2002)

Abstract
Using CCD observations in the narrow band filters in H $\alpha$ , H $\beta$ , [ $\ion{O}{ii}$ ], [ $\ion{O}{iii}$ ], [ $\ion{S}{ii}$ ] and [ $\ion{S}{iii}$ ] lines we have compiled a catalogue of 338 $\ion{H}{ii}$ regions for the inner parts of NGC 5457 and 158 for NGC 4395. The extinction, equivalent widths, distributions, excitations, ionization hardness, ionization parameters and metallicities for these regions, a distinction being made between arm and inter-arm zones, are presented here with the first results of a study of stellar formation.

Key words: $\ion{H}{ii}$ regions -- galaxies: individual: NGC 4395, NGC 5194 -- galaxies: abundances

Offprint request: B. Cedrés, bce@ll.iac.es

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