Imaging spectrophotometry of a chain of giant H II regions in the galaxy NGC 2997

Details Imaging spectrophotometry of a chain of giant H II regions in the galaxy NGC 2997 Imaging spectrophotometry of a chain of giant H II regions in the galaxy NGC 2997

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..883r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Oct. 15, 1987, p. 883-905. NSERC-supported researc

Astronomy and Astrophysics

Astronomy

21

Abundance, Astronomical Spectroscopy, H Ii Regions, Line Spectra, Spiral Galaxies, Data Reduction, Early Stars, Signal To Noise Ratios, Spectrophotometry

Scientific paper

An area of 120arcsec×16arcsec of the northern arm of the spiral galaxy NGC 2997 was scanned with the slit of the RGO spectrograph using the ASPECT system of the Anglo-Australian Telescope. 530 spectra were obtained. Monochromatic images and diagnostic diagrams of line ratios based on spectral lines at Hα, Hβ, [O II] 3727 Å, [O III] 5007 Å, [N II] 6584 Å and [S II] 6717 - 30 Å, and continua at 3580 Å and 5400 Å are constructed. Correlations are found between the absorption AV and the oxygen abundance index ([O II]+[O III])/Hβ indicating that the hotter stars are imbedded in more dust than the later-type stars. Reddening also arises from external dust; this dust is closely associated with the H II regions, because the stellar continuum is found to be less affected by reddening. Synthesis of the spiral arm stellar continuum was performed and the spectral signature of early-type stars was clearly detected in the H II regions.

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