An optical study of NGC 7538

Details An optical study of NGC 7538 An optical study of NGC 7538

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..532l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 15, 1986, p. 532-537.

Astronomy and Astrophysics

Astronomy

5

Astronomical Spectroscopy, Nebulae, Visible Spectrum, Abundance, Electron Density (Concentration), Infrared Astronomy, Light Scattering, Line Spectra

Scientific paper

Optical observations of NGC 7538 using CCD frames and interference filters isolating the nebular lines and continuum have been used to derive emission-line fluxes of the optical nebula and to discuss the nature of the infrared sources. The forbidden S II ratio demonstrates that the electron density increases from 500 to greater than 10,000/cu cm from the northeast to the southwest, in a manner similar to the change in extinction derived from the ratio of H-alpha/5 GHz fluxes. It is argued that IRS 1 and 2 may have an extinction component that is wavelength independent in the optical (8000-4000 A) region.

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