scholarly journals Working Group on Ap and Related Stars: (Groupe de Travail Pour Les Etoiles Particulieres de Type a)

2000 ◽  
Vol 24 (1) ◽  
pp. 249-250
Author(s):  
Masahide Takada-Hidai ◽  
Georges Alecian ◽  
Richard O. Gray ◽  
Marco Landolfi ◽  
Pierre North ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Working Group ◽  
Diffusion Processes ◽  
Type A ◽  
Atomic Data ◽  
Large Telescope ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Chemically Peculiar Stars

The JD 16 was held on August 25, 1997 as one-day session with the title of “Spectroscopy with Large Telescope of Chemically Peculiar Stars”. It was supported by the Division IV and Commissions 14, 27, 29, 36, and 45.The members of SOC were: G. Alecian, J. Babel, M. Gerbaldi, R. O. Gray, G. Mathys, P. North, M. Takada-Hidai (Chairperson), and J. Zverko (Co-chairperson).15 talks and 18 contributed posters were presented on six topics of (1) model atmospheres and atomic data, (2) stellar parameters, (3) LTE and NLTE abundance analyses, (4) diffusion processes, (5) magnetic fields, and (6) variabilities. Approximate number of participants amounted to 50 at maximum.

scholarly journals 29. Stellar Spectra

1982 ◽  
Vol 18 (1) ◽  
pp. 343-360 ◽  
Author(s):  
W.K. Bonsack
Keyword(s):  
Stellar Evolution ◽  
Working Group ◽  
Main Sequence ◽  
Symbiotic Stars ◽  
Be Stars ◽  
Stellar Spectra ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Chemically Peculiar Stars ◽  
Ap Stars

During the interval covered by this report, Commission 29 has sponsored or cosponsored the following IAU meetings: Symposium 98 on “Be Stars,” Munich, FRG, April 1981; Colloquium 59, “Effects of Mass-Loss on Stellar Evolution,” Trieste, Italy, September 1980; and Colloquim 70, “The Nature of Symbiotic Stars,” Haute-Provence, France, August 1981. In addition, Commission 29, through its Working Group on Ap Stars, collaborated in the organization of the 23rd Liege International Astrophysical Symposium on Upper Main-Sequence Chemically Peculiar Stars. Several IAU symposia and colloquia proposed for 1982 and 1983 are also cosponsored by Commission 29.

scholarly journals A Magnetic Snapshot Survey of F-Type Stars

2020 ◽  
Author(s):  
J M Seach ◽  
S C Marsden ◽  
B D Carter ◽  
C Neiner ◽  
C P Folsom ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Longitudinal Magnetic Field ◽  
Convection Zone ◽  
Stellar Radius ◽  
Spectral Class ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
The Mean ◽  
Chemically Peculiar Stars ◽  
F Stars

Abstract We present a spectropolarimetric magnetic snapshot survey of 55 stars which includes 53 F-type stars ranging from spectral types F0 to F9 plus 2 chemically peculiar stars β CrB, and δ Cap. We look for magnetic fields in stars spanning a range of effective temperatures where the transition from fossil to dynamo magnetic fields is believed to occur. High-resolution spectropolarimetry using circularly polarized spectra is used to look for a magnetic detection in the Stokes V profile, determine the mean longitudinal magnetic field (Bl), and to look for correlations with stellar parameters. Surface magnetic fields are detected on 14 F-stars, and present in every spectral class from F3V-F9V ranging in strength from 0.3 ± 0.1 G (36 UMa, F8V) to 8.3 ± 0.9 G (h Dra, F8V). Thus we find photospheric magnetic fields are present in stars as early as spectral type F3V with an outer convection zone thickness less than a few per cent of the stellar radius.

scholarly journals The Origin and Structure of the Magnetic Fields of the Chemically Peculiar Stars

1986 ◽  
Vol 90 ◽  
pp. 1-10
Author(s):  
David Moss
Keyword(s):  
Magnetic Fields ◽  
Internal Structure ◽  
Time Dependent ◽  
Dynamo Theory ◽  
Current Time ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Theoretical Predictions ◽  
Chemically Peculiar Stars ◽  
Coherent Picture

AbstractRival theories for the origin of the magnetic fields present in the CP stars are discussed, particular attention being paid to the claims of the ‘contemporary dynamo’ and ‘fossil’ theories. The internal structure of the field as predicted by calculations consistent with the fossil theory is discussed at length. It seems that current time dependent models can now give a coherent picture of the fields of the CP stars according to the fossil theory. Dynamo theory modelling has not been developed in such detail. As yet neither the theoretical predictions nor the observational material seem to be detailed enough to allow a decisive comparison between the theories.

scholarly journals Detection of magnetic fields in chemically peculiar stars observed with the K2 space mission

2018 ◽  
Vol 478 (2) ◽  
pp. 2777-2793 ◽  
Author(s):  
B Buysschaert ◽  
C Neiner ◽  
A J Martin ◽  
C Aerts ◽  
D M Bowman ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Space Mission ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Chemically Peculiar Stars

scholarly journals Investigations of the Magnetic Fields of Chemically Peculiar Stars of Different Age

1986 ◽  
Vol 90 ◽  
pp. 29-32
Author(s):  
Yu.V. Glagolevskij ◽  
V.G. Klochkova ◽  
I.M. Kopylov
Keyword(s):  
Magnetic Fields ◽  
Open Clusters ◽  
Special Astrophysical Observatory ◽  
Open Clusters And Associations ◽  
Origin And Evolution ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Chemically Peculiar Stars ◽  
Stellar Magnetic Fields

The program of comprehensive investigations of stellar magnetism in the Special Astrophysical Observatory of the USSR AS includes the study of origin and evolution of the stellar magnetic fields in open clusters and associations of different age. In the papers by Borra (1981), Brown et al. (1981) and North and Cramer (1984) have been found some indications on the evolutionary decay of the fossil stellar fields.

Sign in / Sign up

Export Citation Format

Share Document