A search for solar-like oscillations in the Am star HD 209625
Abstract
Aims:The goal is to test the structure of hot metallic stars, and in particular the structure of a near-surface convection zone using asteroseismic measurements. Indeed, stellar models including a detailed treatement of the radiative diffusion predict the existence of a near-surface convection zone in order to correctly reproduce the anomalies in surface abundances that are observed in Am stars.
Methods: The Am star
Results: The power spectrum associated with these RV measurements does not present any excess. Therefore, either the structure of the external layers of this star does not allow excitation of solar-like oscillations, or the amplitudes of the oscillations remain below 20-30 cm s-1 (depending on their frequency range).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 2007
- DOI:
- 10.1051/0004-6361:20067022
- arXiv:
- arXiv:0706.0803
- Bibcode:
- 2007A&A...470.1009C
- Keywords:
-
- stars: chemically peculiar;
- stars: individual: HD 209625;
- stars: interiors;
- stars: oscillations;
- stars: binaries: spectroscopic;
- techniques: radial velocities;
- Astrophysics
- E-Print:
- 5 pages, 4 figures, A&