Based on observations collected at the European Southern Observatory, Chile, as part of programmes 080.D-0191(A) and 078.D-0080(A).
HD 97394: a magnetic Ap star with high cerium overabundance★
Article first published online: 26 MAY 2011
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
Monthly Notices of the Royal Astronomical Society
Volume 415, Issue 3, pages 2233–2237, August 2011
How to Cite
Elkin, V. G., Kurtz, D. W. and Mathys, G. (2011), HD 97394: a magnetic Ap star with high cerium overabundance. Monthly Notices of the Royal Astronomical Society, 415: 2233–2237. doi: 10.1111/j.1365-2966.2011.18850.x
- Issue published online: 2 AUG 2011
- Article first published online: 26 MAY 2011
- Accepted 2011 April 4. Received 2011 March 30
- stars: atmospheres;
- stars: chemically peculiar;
- stars: individual: HD 97394;
- stars: magnetic field
We report a spectroscopic analysis of the chemically peculiar Ap star HD 97394. 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 Ce iii and Eu iii. Abundances obtained from second ionization lines of Nd, Ce and Eu are about 2 dex higher than for those of the first ionization. From partially split Zeeman components of the Fe ii 6149.258 Å line and from synthetic modelling, a global magnetic field of 3.1 kG 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 30–40 m s−1 for individual lines of rare earth elements, of 10–20 m s−1 for the combination of several lines, and of 6–10 m s−1 for cross-correlation over large spectral bands.