Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars

Details Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...412..771j&link_type=abstract

Astronomy and Astrophysics, v.412, p.771-776 (2003)

Astronomy and Astrophysics

Astrophysics

5

Atomic Processes, Line: Formation, Radiation Mechanisms: Non-Thermal, Stars: Individual: Η Car, Ae And

Scientific paper

Two UV lines of Fe II at 2507/2509 Å are extremely bright in spatially resolved HST/STIS spectra of dense gas condensations (the so called Weigelt blobs) close to the central star of η Carinae. The lines also appear unresolved in HST/FOS spectra of the star AE And. Under normal conditions the lines should hardly be observable. Based on recent studies of the formation of the łambdałambda2507/2509 lines as part of a radiative cycle driven by HLyα pumping and including stimulated emission we propose the possibility of using them as a probe of non-homogeneities in gas condensations located outside hot, massive stars.

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