EXPERIMENTAL Pd II OSCILLATOR STRENGTHS AND THE PALLADIUM ABUNDANCE IN THE HgMn-TYPE STAR χ LUPI

摘要

Experimental oscillator strengths for 19 ultraviolet lines of Pd II have been derived from measurements of line intensities in calibrated Fourier transform spectra, combined with picosecond-pulse laser measurements of radiative lifetimes. Five of these 19 lines, in addition to other Pd II lines, are present in Hubble Space Telescope/Goddard High-Resolution Spectrograph echelle spectra of the chemically peculiar HgMn star χ Lupi, yielding a palladium abundance of log (N_(Pd)) = + 5.0, which is 3.3 dex above the solar abundance. Theoretical oscillator strengths have been calculated for all strong ultraviolet transitions associated with the lowest odd-parity configuration of Pd II.