Optical study of NGC 7538
Journal Article
·
· Astrophys. J.; (United States)
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. 26 references.
- Research Organization:
- Kitt Peak National Observatory, Tucson, AZ
- OSTI ID:
- 6931824
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 306; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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