Chemical Abundances of NGC 5461 and NGC 5471 Derived from Echelle Spectrophotometry

Bibcode
2002RMxAA..38...97L
Luridiana, V.; Esteban, C.; Peimbert, M.; Peimbert, A.
Bibliographical reference

Revista Mexicana de Astronomía y Astrofísica Vol. 38, pp. 97-109 (2002) (http://www.astroscu.unam.mx/~rmaa/)

Advertised on:
4
2002
Number of authors
4
IAC number of authors
1
Citations
22
Refereed citations
19
Description
We present high resolution spectroscopic data of the two giant extragalactic H II regions NGC 5461 and NGC 5471 in M101, which have been obtained with the 2.1-m telescope of the Observatorio Astronómico Nacional in San Pedro Martir, Baja California. We measured the intensities of several H and He recombination lines, and of forbidden lines of a large number of ions. 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 ( icf's) to the observed ionic abundances. For NGC 5461, the icf's are based on a tailored photoionization model of the region (Luridiana & Peimbert 2001), while for NGC 5471 they are computed from those predicted by a photoionization model of NGC 2363 (Luridiana, Peimbert, & Leitherer 1999), a region which is similar to NGC 5471 in the ionization structure. For both regions, the icf's are compared to those computed following the prescriptions by Mathis & Rosa (1991). Such comparison shows large discrepancies for several elements, including nitrogen, neon, and chlorine.
Type
Refereed
H II regions

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