EDP Sciences
Free access
Volume 422, Number 2, August I 2004
Page(s) 511 - 514
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20047055

A&A 422, 511-514 (2004)
DOI: 10.1051/0004-6361:20047055

The oxygen abundance gradient in M 101 : The reliability of the P method

B. Cedrés1, M. A. Urbaneja1 and J. Cepa1, 2

1  Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
    e-mail: bce@ll.iac.es
2  Departamento de Astrofísica, Facultad de Física, Universidad de La Laguna, 38071 La Laguna, Tenerife, Spain

(Received 12 January 2004 / Accepted 27 April 2004)

We present the oxygen abundance determination for 90  $\ion{H}{ii}$ regions in the inner parts of the grand design galaxy M 101. The abundances were derived employing the  P method (Pilyugin 2001a). A comparison is made with previous determinations using another calibration and direct measurements of electron temperature to derive the oxygen abundance. The results show agreement with the abundances derived from the electron temperature method and also show that the older calibration is not as accurate as the  P method.

Key words: ISM: $\ion{H}{ii}$ regions -- galaxies: individual: NGC 5457 -- galaxies: abundances

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