Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain e-mail: email@example.com
2 Departamento de Astrofísica, Facultad de Física, Universidad de La Laguna, 38071 La Laguna, Tenerife, Spain
Accepted: 27 April 2004
We present the oxygen abundance determination for 90 HII regions in the inner parts of the grand design galaxy M 101. The abundances were derived employing the P method (Pilyugin [CITE]). 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: HII regions / galaxies: individual: NGC 5457 / galaxies: abundances
© ESO, 2004