Volume 421, Number 1, July I 2004
|Page(s)||L1 - L4|
|Published online||11 June 2004|
Letter to the Editor
The Ca II infrared triplet as indicator of anomalous Ca isotopic mixture in HgMn stars *
Instituto di Astrofisica Spaziale e Fisica Cosmica, CNR, via del Fosso del Cavaliere, 00133 Roma, Italy
2 Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, Trieste, Italy
3 European Southern Observatory, Casilla 19001, Santiago 19, Chile
Corresponding author: F. Castelli, email@example.com
Accepted: 8 May 2004
For the first time we present observational evidence for an anomalous isotopic structure of in mercury–manganese (HgMn) stars. The centroid wavelengths of infrared triplet lines in a number of stars have been found redshifted with respect to the centroids of the terrestrial lines. The record holder is the star HD 175640 for which the measured wavelength is consistent with being present in the atmosphere entirely in form of the heaviest stable isotope . This is a very striking result as makes up only 0.187% of the terrestrial Ca mixture.
Key words: stars: abundances / stars: atmospheres / stars: chemically peculiar / stars: atomic data / stars
© ESO, 2004
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