A semi-automatic procedure for abundance determination of A- and F-type stars
arXiv:0904.0105 · doi:10.1111/j.1365-2966.2009.14848.x
Abstract
A variety of physical processes leading to different types of pulsations and chemical compositions is observed among A- and F-type stars. To investigate the underlying mechanisms responsible for these processes in stars with similar locations in the H-R diagram, an accurate abundance determination is needed, among others. Here, we describe a semi-automatic procedure developed to determine chemical abundances of various elements ranging from helium to mercury for this type of stars. We test our procedure on synthetic spectra, demonstrating that our procedure provides abundances consistent with the input values, even when the stellar parameters are offset by reasonable observational errors. For a fast-rotating star such as Vega, our analysis is consistent with those carried out with other plane-parallel model atmospheres. Simulations show that the offsets from the input abundances increase for stars with low inclination angle of about 4 degrees. For this inclination angle, we also show that the distribution of the iron abundance found in different regions is bimodal. Furthermore, the effect of rapid rotation can be seen in the peculiar behaviour of the H_beta line.
accepted for publication in MNRAS, contains 6 tables and 8 figures
References in corpus (11)
- Effects of gravitational darkening on the determination of fundamental parameters in fast rotating B-type stars
- Automated spectroscopic abundances of A and F-type stars using echelle spectrographs II. Abundances of 140 A-F stars from ELODIE and CORALIE
- A spectroscopic study of southern (candidate) gamma Doradus stars. II. Detailed abundance analysis and fundamental parameters
- Fundamental parameters of Be stars located in the seismology fields of COROT
- Abundance analysis of targets for the COROT / MONS asteroseismology missions II. Abundance analysis of the COROT main targets
- Chemical composition of A and F dwarfs members of the Pleiades open cluster
- Abundance analysis of targets for the COROT / MONS asteroseimology missions I. Semi-automatic abundance analysis of the gamma Dor star HD 49434
- Automated spectroscopic abundances of A and F-type stars using echelle spectrographs I. Reduction of ELODIE spectra and method of abundance determination
- Spectral disentangling of the triple system DG Leo: orbits and chemical composition
- The effect of rotation on the spectrum of Vega
- Search for pulsation among suspected A-type binaries and the new multiperiodic Delta Scuti star HD217860