2010A&A...516A..53A


Query : 2010A&A...516A..53A

2010A&A...516A..53A - Astronomy and Astrophysics, volume 516, A53-53 (2010/6-2)

Bi-dimensional element stratifications computed for magnetic Ap star atmospheres.

ALECIAN G. and STIFT M.J.

Abstract (from CDS):

Theoretical modelling of abundance stratifications and surface distributions of chemical elements in Ap stars constitutes a major challenge. The atomic diffusion model provides the most appropriate framework in which to understand these abundance anomalies. We present theoretical 2D stratifications of 16 metals in upper main sequence chemically peculiar stars, with and without magnetic fields to provide a reference point for further theoretical and observational studies. We used our code CaratStrat to compute a large grid of stratifications (equilibrium solutions in LTE) for plane-parallel Teff=8500, 10000, 12000, and 14000K stellar atmospheres. By interpolation, we constructed bi-dimensional cuts through these stellar atmospheres, which are permeated by a dipolar magnetic field of strength 20kG at the magnetic pole. We also provide vertical (1D) stratifications of metals in non-magnetic stars (HgMn). We present a large number of 2D and 1D stratifications, mostly as online material. We discuss in detail the case of Fe for the Teff=8500K model in the printed version, and compare it with stratifications derived from observed spectra.

Abstract Copyright:

Journal keyword(s): diffusion - stars: abundances - stars: chemically peculiar - stars: magnetic field

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 66318 * 07 59 27.4731907320 -60 47 47.144978988   9.69 9.56   9.555 A0pEuCrSr 90 0
2 * 53 Cam a2* 08 01 42.4403874648 +60 19 27.806833200   6.177 6.008     A3VpSrSiCrEu 389 0
3 HD 133792 * 15 09 25.5217838448 -63 38 34.549433448   6.298 6.247     ApSrCrEu 73 0
4 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 671 0
5 HD 144897 * 16 09 51.1821697368 -41 09 27.768423492   8.81 8.59     ApEuCr 49 0
6 HD 170973 a2* 18 32 06.8865165216 +03 39 34.601753412   6.381 6.407     B9IIIpSi 122 0
7 V* V1291 Aql a2* 19 53 18.7357174440 -03 06 52.063556976   5.837 5.619     F0VpSrCrEu 268 0
8 HD 188091 PM* 19 54 43.3170559920 -33 17 14.170845768   10.416 9.57     K1/2V 29 0

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2022.05.28-13:31:30

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