Detailed spectrophotometric study of the giant H II region NGC 604

Details Detailed spectrophotometric study of the giant H II region NGC 604 Detailed spectrophotometric study of the giant H II region NGC 604

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226...19d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 1, 1987, p. 19-37.

Astronomy and Astrophysics

Astronomy

92

Astronomical Photometry, H Ii Regions, Infrared Spectra, Spectrophotometry, Visible Spectrum, Abundance, Astronomical Models, Electron Energy, Oxygen Spectra

Scientific paper

Detailed spectrophotometry in the visual and near-infrared is presented for four different slit positions over the core of NGC 604. The excitation ([O II]/[O III]) varies considerably both along the slit and between different slit positions, but the line ratios ([O II]+[O III])/Hβ, [N II]/[O II], [N II]/[S II] and ([O II]/Hβ)×([O II]/[S II]) are effectively constant, confirming the suitability of these line ratios as abundance-related parameters characterizing an entire giant H II region. The [O III] electron temperature shows significant variations across the nebula, but no significant variations in relative abundances of O, N, Ne and S are found. By introducing a new ionization correction scheme the authors determine a helium abundance Y = 0.260±0.013 and this is also constant except possibly in one place where the correction for neutral helium is very uncertain. The spectrum is consistent with ionizing stars having a representative effective temperature of 40000K (blanketed LTE models) or 37000K (non-LTE models).

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