Bibcode
Hekker, S.; Frémat, Y.; Lampens, P.; De Cat, P.; Niemczura, E.; Creevey, O. L.; Zorec, J.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 3, pp. 1689-1698.
Advertised on:
7
2009
Número de citas
4
Número de citas referidas
3
Descripción
A variety of physical processes leading to different types of pulsations
and chemical compositions are observed between A- and F-type stars. To
investigate the underlying mechanisms responsible for these processes in
stars with similar locations in the Hertzsprung-Russell 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°. 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 Hβ
line.
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