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Chemical abundances of the H II regions NGC 5461 and NGC 5471 in M 101, Derived from echelle spectrophotometry

Published online by Cambridge University Press:  26 May 2016

Valentina Luridiana ,
César Esteban ,
Manuel Peimbert  and
Antonio Peimbert
Valentina Luridiana
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Camino Bajo de Huétor 24, Apartado 3004, E-18080 Granada, España
César Esteban
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38200 La Laguna, Tenerife, España
Manuel Peimbert
Affiliation:
Instituto de Astronomía (UNAM), Ciudad Universitaria, Apartado Postal 70-264, 04510 México D.F., México
Antonio Peimbert
Affiliation:
Instituto de Astronomía (UNAM), Ciudad Universitaria, Apartado Postal 70-264, 04510 México D.F., México

Abstract

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We present high resolution spectroscopic data of the two giant extragalactic H ii regions NGC 5461 and NGC 5471 in M 101. We calculate the physical conditions in the two nebulae with a large number of diagnostics, and determine their chemical abundances by applying ionization correction factors (icfs) to the observed ionic abundances. The comparison of the icfs based on photo-ionization models (Luridiana & Peimbert 2001; Luridiana et al. 1999) to those computed following the prescriptions by Mathis & Rosa (1991) shows large discrepancies for several elements, including nitrogen, neon and chlorine.

Type
Part 4. Feedback from Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 730 - 731
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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