Surface Magnetic Field Measurements in Hot Chemically Peculiar Stars

1988 ◽  
pp. 313-316
Author(s):  
Pierre Didelon
Keyword(s):  
Magnetic Field ◽  
Field Measurements ◽  
Surface Magnetic Field ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Magnetic Field Measurements ◽  
Chemically Peculiar Stars

scholarly journals Surface Magnetic Field Measurements in Hot Chemically Peculiar Stars

1988 ◽  
Vol 132 ◽  
pp. 313-316
Author(s):  
Pierre. Didelon
Keyword(s):  
Magnetic Field ◽  
Field Measurements ◽  
Surface Magnetic Field ◽  
Surface Field ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Magnetic Field Measurements ◽  
First Results ◽  
Chemically Peculiar Stars ◽  
Good Agreement

The first results of magnetic field measurements are presented here for HD 187474, a slowly rotating Ap star. From resolved Zeeman pattern the strength of the field and its mean inclination were obtained. From differential magnetic broadening a second value of the field strength has been deduced, which is compatible with the previous one. The “Robinson” method has been tested and a good agreement is found between observed and calculated Zeeman broadening of FeII lines. This method can therefore certainly be used to measure the surface field in slow rotating chemically peculiar stars.

scholarly journals The Nonhomogeneous Distribution of Abundances and the Magnetic Field Measurements in CP Stars

1986 ◽  
Vol 90 ◽  
pp. 149-149
Author(s):  
F.A. Catalano
Keyword(s):  
Magnetic Field ◽  
Field Measurements ◽  
Homogeneous Distribution ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Magnetic Field Measurements ◽  
Chemically Peculiar Stars ◽  
The Magnetic Field

AbstractThe influence of the non homogeneous distribution of the abundance of elements on the magnetic field measurements in chemically peculiar stars is discussed.

scholarly journals K2 space photometry reveals rotational modulation and stellar pulsations in chemically peculiar A and B stars

2018 ◽  
Vol 616 ◽  
pp. A77 ◽  
Author(s):  
D. M. Bowman ◽  
B. Buysschaert ◽  
C. Neiner ◽  
P. I. Pápics ◽  
M. E. Oksala ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Large Scale ◽  
Intrinsic Variability ◽  
B Stars ◽  
Pulsating Stars ◽  
Chemically Peculiar ◽  
Large Scale Magnetic Field ◽  
Peculiar Stars ◽  
Show Evidence ◽  
Chemically Peculiar Stars

Context. The physics of magnetic hot stars and how a large-scale magnetic field affects their interior properties is largely unknown. Few studies have combined high-quality observations and modelling of magnetic pulsating stars, known as magneto-asteroseismology, primarily because of the dearth of detected pulsations in stars with a confirmed and well-characterised large-scale magnetic field. Aims. We aim to characterise observational signatures of rotation and pulsation in chemically peculiar candidate magnetic stars using photometry from the K2 space mission. Thus, we identify the best candidate targets for ground-based, optical spectropolarimetric follow-up observations to confirm the presence of a large-scale magnetic field. Methods. We employed customised reduction and detrending tools to process the K2 photometry into optimised light curves for a variability analysis. We searched for the periodic photometric signatures of rotational modulation caused by surface abundance inhomogeneities in 56 chemically peculiar A and B stars. Furthermore, we searched for intrinsic variability caused by pulsations (coherent or otherwise) in the amplitude spectra of these stars. Results. The rotation periods of 38 chemically peculiar stars are determined, 16 of which are the first determination of the rotation period in the literature. We confirm the discovery of high-overtone roAp pulsation modes in HD 177765 and find an additional 3 Ap and Bp stars that show evidence of high-overtone pressure modes found in roAp stars in the form of possible Nyquist alias frequencies in their amplitude spectra. Furthermore, we find 6 chemically peculiar stars that show evidence of intrinsic variability caused by gravity or pressure pulsation modes. Conclusions. The discovery of pulsations in a non-negligible fraction of chemically peculiar stars make these stars high-priority targets for spectropolarimetric campaigns to confirm the presence of their expected large-scale magnetic field. The ultimate goal is to perform magneto-asteroseismology and probe the interior physics of magnetic pulsating stars.

Features of magnetic field structures in chemically peculiar stars. IV

2016 ◽  
Vol 71 (4) ◽  
pp. 453-462 ◽  
Author(s):  
Yu. V. Glagolevskij ◽  
A. F. Nazarenko
Keyword(s):  
Magnetic Field ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Chemically Peculiar Stars
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