New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae

Details New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...361..977j&link_type=abstract

Astronomy and Astrophysics, v.361, p.977-981 (2000)

Astronomy and Astrophysics

Astrophysics

29

Atomic Processes, Line: Identification, Stars: Individual: Eta Car, Stars: Variables: General, Ultraviolet: Stars

Scientific paper

We discuss the origin of eight emission lines in the spectra of gas blobs close to the central star of eta Carinae. The spectra have been obtained with the Goddard High Resolution Spectrograph (GHRS) and the Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telescope. Between 2400 and 2500 Å five narrow lines are identified as new forbidden lines of doubly ionized iron, [Fe III]. We present gA-value data for the corresponding transitions, which combine two different metastable configurations of Fe III. An anomalous intensity of the narrow Fe III line (UV 34) at 1914 Å is explained as fluorescence due to HLyalpha pumping. A level mixing of about 1% increases the f-value of the pumped excitation channel by more than two orders of magnitude, which makes the pumping efficient and the fluorescence significant. We introduce a new designation for fluorescence lines photoexcited by an accidental resonance, eg. < Fe III> in the case of doubly ionized iron. Based on observations with the NASA/ESA Hubble Space Telescope, and supported by grant numbers GO-6501 and GO-7302 from the Space Telescope Science Institute. The STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

Affiliated with

Also associated with

No associations

Rating

New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1522091