EDP Sciences
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Volume 402, Number 1, April IV 2003
Page(s) 299 - 313
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030213

A&A 402, 299-313 (2003)
DOI: 10.1051/0004-6361:20030213

On the elemental abundance and isotopic mixture of mercury in HgMn stars

L. Dolk1, G. M. Wahlgren1 and S. Hubrig2

1  Atomic Astrophysics, Lund Observatory, Lund University, Box 43, 22100, Lund, Sweden
2  European Southern Observatory, Casilla 19001, Santiago 19, Chile

(Received 2 July 2002 / Accepted 13 February 2003)

Optical region spectra of 31 HgMn stars have been studied for the abundance and isotope mixture of mercury. In the course of the investigation the lines $\ion{Hg}{i}$  $\lambda$4358 and $\ion{Hg}{ii}$ $\lambda$ $\lambda$3984,6149 have been studied, with abundances established for all three lines in several HgMn stars. The mercury isotope mixture has been determined from high resolution spectra of the  $\lambda$3984 line. Possible signs of an ionization anomaly have been detected by the comparison of the abundance derived from the $\ion{Hg}{i}$ line and the $\ion{Hg}{ii}$ lines in seven of the observed HgMn stars. A possible correlation of the mercury abundance with Teff has been detected. Possible signs of a weak anticorrelation of the manganese and mercury abundance in HgMn stars have been found, which could be interpreted as a sign of inhomogeneous surface distribution of these elements. For a number of the HgMn stars in this study the mercury abundance and isotope mixture are reported for the first time.

Key words: stars: abundances -- stars: chemically peculiar

Offprint request: L. Dolk, linus.dolk@astro.lu.se

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