HD97394: a magnetic Ap star with high cerium overabundance

ABSTRACT We report a spectroscopic analysis of the chemically peculiar Ap star HD97394. The stellar spectrum is rich in lines of rare earth elements with large overabundances, especially cerium, gadolinium and europium. Enhancement of the abundances of these rare earths shows this star to be one of...

Full description

Saved in:
Bibliographic Details
Published inMonthly notices of the Royal Astronomical Society Vol. 415; no. 3; pp. 2233 - 2237
Main Authors Elkin, V. G, Kurtz, D. W, Mathys, G
Format Journal Article
LanguageEnglish
Published London Oxford University Press 01.08.2011
Subjects
Astronomy
Chemical elements
Spectrum analysis
Stars & galaxies
Trace elements
Online AccessGet full text

Cover

More Information
Summary:ABSTRACT We report a spectroscopic analysis of the chemically peculiar Ap star HD97394. The stellar spectrum is rich in lines of rare earth elements with large overabundances, especially cerium, gadolinium and europium. Enhancement of the abundances of these rare earths shows this star to be one of the most peculiar stars. Very large overabundances were found for lines of Ceiii and Euiii. Abundances obtained from second ionization lines of Nd, Ce and Eu are about 2dex higher than for those of the first ionization. From partially split Zeeman components of the Feii 6149.258Å line and from synthetic modelling, a global magnetic field of 3.1kG was measured. We tested for pulsation of the star with high time resolution spectroscopy obtained with the ESO Very Large Telescope. We place an upper limit to any pulsation amplitude of 30-40ms-1 for individual lines of rare earth elements, of 10-20ms-1 for the combination of several lines, and of 6-10ms-1 for cross-correlation over large spectral bands. [PUBLICATION ABSTRACT]
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2011.18850.x