Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...504..533b&link_type=abstract
Astrophysical Journal v.504, p.533
Astronomy and Astrophysics
Astronomy
7
Atomic Data, Stars: Abundances, Stars: Chemically Peculiar, Stars: Individual Bright Star Number: Hr 7775, Stars: Individual Constellation Name: Beta Capricorni
Scientific paper
High-resolution spectra have been obtained for the regions of the five strongest optical lines of Pt II in the spectrum of the cool HgMn star HR 7775, which is one of the sharpest-lined HgMn stars known. Model lines have been constructed from the isotopic and hyperfine structure laboratory analysis of Engleman. Abundances of the individual isotopes have been determined from spectrum synthesis. The total abundance of Pt is 4.46 dex greater than the adopted solar abundance. The isotopic composition is clearly nonterrestrial, with a pronounced relative enhancement of the heaviest isotope, 198Pt, and deficiencies of isotopes lighter than 196Pt. The pattern of isotopic composition does not follow the widely assumed fractionation formalism; the lighter isotopes are far more deficient than a single-parameter fractionation pattern would predict.
Bohlender David A.
Dworetsky Michael M.
Jomaron C. M.
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