Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..341m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, April 1991, p. 341-346.
Other
14
Astronomical Spectroscopy, Emission Spectra, O Stars, Spectral Resolution, Visible Spectrum, H Ii Regions, Helium, High Resolution, Hydrogen, Stellar Composition
Scientific paper
The unidentified stellar emission lines at 4485 A and 4503 A have been detected in O main-sequence spectra by means of high-resolution, high-S/N observations. Previously these lines were known only in mid- to late-O giant and supergiant spectra; the present result indicates that they have a positive luminosity dependence, similar to that of other selective emission features in O-type spectra. These observations provide high-quality data on the little-studied interstellar diffuse band at 4502 A, the redward wing of which may overlap the stellar 4503 A emission. In lower-resolution observations of the luminous central clusters in the distant giant H II regions NGC 3603 and RCW 49, the 4502 A absorption intensity is similar to that of the stellar helium lines, while interstellar 4430 A is comparable with the hydrogen lines.
Fitzpatrick Edward L.
Morrell Nidia I.
Walborn Nolan R.
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