The Of emission lines near 4650 A

Abstract

view Abstract Citations (11) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Of Emission Lines Near 4650 A Underhill, A. B. ; Gilroy, K. K. ; Hill, G. M. Abstract Rectified, normalized, high S/N intensity tracings of nine Of stars were obtained from Reticon spectra in the 4550-4800-A region. The well-known relatively sharp Of emission lines are seen to stand on pedestals of broad weak emission somewhat like the broad emission lines from WR stars. It is suggested that cascades following dielectronic recombination may be an important process driving some lines of N III, C III, and C IV into the emission of Of stars, and that the sharp Of lines come from plasma that is stationary with respect to the star. The broad emission features show an extensive low-density wind from each star. The results imply that the detection of two, more or less equal, broad jumps in the rest spectra of galaxies at about 4640 and 4686 A is more indicative of Of stars than of WR stars. Publication: The Astronomical Journal Pub Date: September 1989 DOI: 10.1086/115196 Bibcode: 1989AJ.....98.1063U Keywords: Emission Spectra; Line Spectra; O Stars; Stellar Spectra; Visible Spectrum; Carbon; Electron Recombination; Helium; Nitrogen Ions; Plasma Spectra; Wolf-Rayet Stars; Astrophysics; STARS: OF-TYPE full text sources ADS | data products SIMBAD (9)