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Astron. Astrophys. 362, 410-418 (2000)

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The FERRUM project: new experimental and theoretical f-values for 4p-4d transitions in Fe II applied to HST spectra of [FORMULA] Lupi

H. Nilsson 1, C.M. Sikström 1, Z.S. Li 2, H. Lundberg 2, A.J.J. Raassen 4, S. Johansson 1, D.S. Leckrone 3 and S. Svanberg 2

1 Atomic Spectroscopy, Department of Physics, University of Lund, P.O. Box 118, 221 00 Lund, Sweden (hampus.nilsson@fysik.lu.se)
2 Department of Physics, Lund Institute of Technology, P.O. Box 118, 221 00 Lund, Sweden
3 NASA/Goddard Space Flight Center, Code 630, Greenbelt, MD 20771, USA
4 Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands

Received 30 May 2000 / Accepted 8 August 2000


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 [FORMULA] Lupi, recorded with the Hubble Space Telescope .

Key words: atomic data – line: identification – methods: laboratory – ultraviolet: stars – stars: individual: O Lupi

Send offprint requests to: H. Nilsson

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© European Southern Observatory (ESO) 2000

Online publication: October 30, 19100