Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...421l...1c&link_type=abstract
Astronomy and Astrophysics, v.421, p.L1-L4 (2004)
Astronomy and Astrophysics
Astrophysics
17
Stars: Abundances, Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Atomic Data, Stars
Scientific paper
For the first time we present observational evidence for an anomalous isotopic structure of Ca II in mercury-manganese (HgMn) stars. The centroid wavelengths of Ca II infrared triplet lines in a number of stars have been found redshifted with respect to the centroids of the terrestrial Ca II lines. The record holder is the star HD 175640 for which the measured wavelength is consistent with Ca II being present in the atmosphere entirely in form of the heaviest stable isotope 48Ca. This is a very striking result as 48Ca makes up only 0.187% of the terrestrial Ca mixture.
Based on observations obtained at the European Southern Observator, La Silla and Paranal, Chile (ESO programme Nos. 65.L-0316 and 67.D-0579).
Castelli Fabio
Hubrig Svetlana
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