Issue |
A&A
Volume 410, Number 1, October IV 2003
|
|
---|---|---|
Page(s) | 299 - 305 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20031270 | |
Published online | 17 November 2003 |
Vertical distribution of chromium in the atmospheres of HgMn stars *
1
Astrophysical Institute Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
2
Crimean Astrophysical Observatory, Nauchny, Crimea, Ukraine and Isaac Newton Institute of Chile, Crimean Branch
3
European Southern Observatory, Casilla 19001, Santiago 19, Chile e-mail: shubrig@eso.org
Corresponding author: I. Savanov, isavanov@aip.de
Received:
18
June
2003
Accepted:
5
August
2003
We use multiplet 30 lines in the wings of H
to test the hypothesis of an anomalous concentration of Cr in the upper
layers of the atmospheres of a sample of 10 HgMn stars. These lines are at
different distances from the Hβ line center and are therefore formed at
different depths in the stellar atmosphere. Except for HD 49606, all HgMn
stars show an increase in Cr abundance with height in the stellar atmosphere.
A similar vertical distribution
of Cr, but less pronounced, has been previously found in Am stars.
In contrast, no variation of Cr abundance with the depth has been found for the
normal late B-type star HD 196426 and the weak magnetic late B-type star HD 168733.
It is possible that in HgMn stars the vertical stratification parameter, a, depends on
Teff, with the strongest vertical gradient being found in the hotter
stars. No correlation was found between a and the average stellar
abundance
(Cr/H).
Key words: stars: abundances / stars: atmospheres / stars: chemically peculiar
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.