Abundance analysis of seven δ Scuti stars
Abstract
Context: The current knowledge of the abundance pattern in δ Scuti stars is based on analysis of just a few field stars.
Aims: We aim to determine the general chemical properties of the atmospheres of δ Scuti stars based on a statistically relevant sample of stars and investigate whether the abundance pattern is close to solar, an assumption generally made for pulsation models.
Methods: We analysed high-resolution, high signal-to-noise ratio spectra of seven field δ Scuti stars. We derived the fundamental parameters and the photospheric abundances and than compared them to a similar sample of cluster δ Scuti stars.
Results: With the use of a t-test we demonstrate that there is no difference between the two samples, which allows us to merge them, resulting in a sample of fifteen δ Scuti stars. We do not find any substantial difference between the abundance pattern of our sample of δ Scuti stars and a sample of normal early A- and late F-type stars. One field star in our sample, HD 124953, is most likely a pulsating Am star.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 2008
- DOI:
- 10.1051/0004-6361:200809541
- arXiv:
- arXiv:0804.2402
- Bibcode:
- 2008A&A...485..257F
- Keywords:
-
- stars: abundances;
- stars: atmospheres;
- delta Sct;
- Astrophysics
- E-Print:
- accepted by Astronomy &