Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...362..410n&link_type=abstract
Astronomy and Astrophysics, v.362, p.410-418 (2000)
Astronomy and Astrophysics
Astrophysics
12
Atomic Data, Line: Identification, Methods: Laboratory, Ultraviolet: Stars, Stars: Individual: Chi Lupi
Scientific paper
Radiative lifetimes for six highly excited levels in Fe II have been measured at Lund Laser Centre applying the laser induced fluorescence technique and two-step excitation. The energy levels belong to the even-parity 3d6(5D)4d subconfiguration at about 10 eV. Branching fractions (BF:s) of 29 transitions from these levels to the 3d6(5D)4p subconfiguration at about 5 eV have been measured in the wavelength region 2000-3000 Å with the Lund Fourier Transform Spectrometer. By normalizing the BF:s with the lifetimes we get experimental oscillator strengths for these 29 4p-4d lines. The oscillator strengths are compared with new theoretical calculations using the orthogonal operator technique and applied to high-resolution spectra of the star chi Lupi, recorded with the Hubble Space Telescope.
Johansson Sara
Leckrone David S.
Li Selina Z.
Lundberg Hans
Nilsson Hampus
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