Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..438w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 1, p. 438-451
Astronomy and Astrophysics
Astronomy
49
Abundance, Heavy Elements, Peculiar Stars, Stellar Spectra, Ultraviolet Astronomy, Gold, Hubble Space Telescope, Platinum, Ultraviolet Spectra
Scientific paper
Echelle mode spectra obtained with the Goddard High Resolution Spectrograph (GHRS) onboard the Hubble Space Telescope (HST) have been used to determine the abundances of the heavy elements Pt, Au, and Hg in the chemically peculiar HgMn-type stars kappa Cancri and chi Lupi. The abundances were determined by fitting observed line profiles with synthetically generated spectra and are found to be enhanced relative to solar system values by between three and five orders of magnitude in both stars. The Hg isotope mixture in kappa Cancri is found to resemble the terrestrial mixture while that of chi Lupi is dominated by the heaviest isotope. As determined from multiple ionization states, the abundances place constraints upon theories attempting to explain the large superficial abundances of heavy elements.
Brage Tomas
Johansson Sveneric G.
Leckrone David S.
Rosberg Maria
Wahlgren Glenn Michael
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