CAOSP abstracts, Volume: 27, No.: 3, year: 1998
- Author(s): GELBMANN, M.J.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 3, p. 280-284.
- Date: 04/1998
- Title: Chemical composition and fundamental parameters of roAp stars
- Keyword(s): STARS: ABUNDANCES, STARS: ATMOSPHERES, STARS: CHEMICALLY PECULIAR
- Pages: 280 -- 284
Abstract:
Element abundances of three roAp stars, HD 166473, HD 203932, and
HD 217522, were determined using Kurucz model atmospheres with metal
abundances scaled to solar ones and the results were compared with data
from the literature concerning three further roAp stars, normal B and
A stars and two lambda Bootis stars. Up to 38 elements could be identified
and therefore, this work represents the most complete chemical investigation
hitherto published, which can be summarized as follows:
- all investigated roAp stars have a similar abundance pattern,
- the overabundances of rare earth and other heavy elements are comparable
to cool non-pulsating Ap-stars,
- iron belongs to the most deficient and cobalt to the most enhanced elements
in the group of the iron peak elements, and
- the light elements carbon, nitrogen, and oxygen are less abundant than
in atmospheres with abundances scaled to the Sun.
Beside an unexpected possible relation between effective temperature
and metallicity of roAp stars, no outstanding differences from non-pulsating
Ap stars could be detected. This statement, however, suffers from the
lack of comparably detailed investigations of the latter.
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