Improved Atomic Data for Ho II and New Holmium Abundances for the Sun and Three Metal-poor Stars

Details Improved Atomic Data for Ho II and New Holmium Abundances for the Sun and Three Metal-poor Stars Improved Atomic Data for Ho II and New Holmium Abundances for the Sun and Three Metal-poor Stars

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...604..850l&link_type=abstract

The Astrophysical Journal, Volume 604, Issue 2, pp. 850-860.

Astronomy and Astrophysics

Astronomy

39

Atomic Data, Stars: Abundances, Sun: Abundances

Scientific paper

Improved energy levels and hyperfine structure constants for a selected set of Ho II levels were measured from spectra recorded using the 1 m Fourier transform spectrometer (FTS) at the US National Solar Observatory. Branching fractions for the strong blue-UV lines from these levels were also measured from the FTS data and combined with earlier radiative lifetimes from time-resolved laser-induced fluorescence measurements to determine accurate absolute transition probabilities for 22 lines of Ho II. These new laboratory measurements, along with a recently reported partition function for ionized Ho, were used to improve Ho abundance determinations in the Sun and three metal-poor Galactic halo giant stars. The derived solar photospheric holmium abundance, log10ɛ(Ho)=+0.51+/-0.10, is consistent with its meteoritic value, log10ɛ(Ho)=+0.49+/-0.02. In each of the metal-poor, neutron-capture-rich program stars, the holmium abundance relative to those of other rare earth elements agrees well with solar system rapid-neutron-capture abundance values.

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