Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30...58j&link_type=abstract
Astronomy Letters, vol. 30, p. 58-63 (2004)
Astronomy and Astrophysics
Astronomy
4
Scientific paper
We consider the origin of the anomalously high intensity of the ultraviolet Fe II lambda 2507/2509 A lines observed with high spatial and spectral resolutions from gas blobs (GBs) near Carinae. This rare effect in stellar spectra is attributable to a combination of several factors: (1) the high hydrogen density (>10^{8} cm^{-3}) that ensures the blocking of the Lyman continuum by GBs and, accordingly, the formation of a cold H I region with completely ionized Fe atoms; (2) the small distance between the GBs and the central star that ensures a high (>8000-10 000 K) Ly_alpha H spectral temperature, which photoexcites Fe II selectively; and (3) the population of Fe II levels and, accordingly, the opening of a stimulated emission channel, which together with spontaneous transitions creates a radiative cycle where a single Fe II ion can multiply absorb Ly_alpha emission.
Johansson Sara
Letokhov V. S.
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