Zobrazeno 1 - 10
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pro vyhledávání: '"Stift, M. J."'
Autor:
Stift, M. J., Leone, F.
For the observational modeling of horizontal abundance distributions and of magnetic geometries in chemically peculiar (CP) stars, Zeeman Doppler mapping (ZDM) has become the method of choice. Comparisons between abundance maps obtained for CP stars
Externí odkaz:
http://arxiv.org/abs/2104.05574
Akademický článek
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Autor:
Alecian, G., Stift, M. J.
Calculating abundance stratifications in ApBp/HgMn star atmospheres, we are considering mass-loss in addition to atomic diffusion in our numerical code in order to achieve more realistic models. These numerical simulations with mass-loss solve the ti
Externí odkaz:
http://arxiv.org/abs/1811.02267
A method for the determination of integrated longitudinal stellar fields from low-resolution spectra is the so-called slope method, which is based on the regression of the Stokes V signal against the first derivative of Stokes I. Here we investigate
Externí odkaz:
http://arxiv.org/abs/1708.05196
Autor:
Alecian, G., Stift, M. J.
Numerical models for the atmospheres of magnetic ApBp stars have in the past dealt only with centred dipole magnetic field geometries. These models include atomic diffusion that stratifies the abundances of metals according to the local magnetic fiel
Externí odkaz:
http://arxiv.org/abs/1702.08322
We present the chemical abundance analysis of 19 upper main-sequence stars of the young open cluster NGC 6250 (log t ~ 7.42 yr). This work is part of a project aimed at setting observational constraints on the theory of atomic diffusion in stellar ph
Externí odkaz:
http://arxiv.org/abs/1612.05739
Autor:
Vélez, J. C. Ramírez, Stift, M. J., Navarro, S. G., Córdova, J. P., Sabin, L., Ruelas-Mayorga, A.
Publikováno v:
A&A 596, A62 (2016)
Context. A lot of effort has been put into the detection and determination of stellar magnetic fields using the spectral signal obtained from the combination of hundreds or thousands of individual lines, an approach known as multi-line techniques. Ho
Externí odkaz:
http://arxiv.org/abs/1609.06278
We present a detailed analysis of the reliability of abundance and magnetic maps of Ap stars obtained by Zeeman Doppler mapping (ZDM). It is shown how they can be adversely affected by the assumption of a mean stellar atmosphere instead of appropriat
Externí odkaz:
http://arxiv.org/abs/1110.1291
Autor:
Semel, M., Velez, J. C. Ramirez, Gonzalez, M. J. Martinez, Ramos, A. Asensio, Stift, M. J., Ariste, A. Lopez, Leone, F.
In order to get a significant Zeeman signature in the polarised spectra of a magnetic star, we usually 'add' the contributions of numerous spectral lines; the ultimate goal is to recover the spectropolarimetric prints of the magnetic field in these l
Externí odkaz:
http://arxiv.org/abs/0906.4226
Autor:
Stift, M. J., Alecian, G.
Over the last decades, modelling of the inhomogeneous vertical abundance distributions of various chemical elements in magnetic peculiar A-type has largely relied on simple step-function approximations. In contrast, the recently introduced regularise
Externí odkaz:
http://arxiv.org/abs/0901.0653