290 research outputs found
The constant magnetic field of xi 1 CMa: geometry or slow rotation?
We report recent observations of the sharp-lined magnetic beta Cep pulsator
xi 1 CMa (= HD 46328). The longitudinal magnetic field of this star is detected
consistently, but it is not observed to vary strongly, during nearly 5 years of
observation. In this poster we evaluate whether the nearly constant
longitudinal field is due to intrinsically slow rotation, or rather if the
stellar or magnetic geometry is responsible
No evidence of a strong magnetic field in the Blazhko star RR Lyrae
Astronomy and Astrophysics, v. 413, p. 1087-1093, 2004. http://dx.doi.org/10.1051/0004-6361%3a20031600International audienc
Analysis of Magnetic field Geometry and Its Interaction with Circumstellar Environment of HD 57682 by the MiMeS Collaboration
Analysis of Magnetic field Geometry and Its Interaction with Circumstellar Environment of HD 57682 by the MiMeS Collaboration
Magnetism, rotation and accretion in Herbig Ae-Be stars
Studies of stellar magnetism at the pre-main sequence phase can provide
important new insights into the detailed physics of the late stages of star
formation, and into the observed properties of main sequence stars. This is
especially true at intermediate stellar masses, where magnetic fields are
strong and globally organised, and therefore most amenable to direct study.
This talk reviews recent high-precision ESPaDOnS observations of pre-main
sequence Herbig Ae-Be stars, which are yielding qualitatively new information
about intermediate-mass stars: the origin and evolution of their magnetic
fields, the role of magnetic fields in generating their spectroscopic activity
and in mediating accretion in their late formative stages, and the factors
influencing their rotational angular momentum.Comment: 8 page
Confirmation of ξ1 CMa's ultra-slow rotation:magnetic polarity reversal and a dramatic change in magnetospheric UV emission lines
Confirmation of ξ1 CMa's ultra-slow rotation:magnetic polarity reversal and a dramatic change in magnetospheric UV emission lines
The magnetic beta Cep pulsator xi^1 CMa has the longest rotational period of
any known magnetic B-type star. It is also the only magnetic B-type star with
magnetospheric emission that is known to be modulated by both rotation and
pulsation. We report here the first unambiguous detection of a negative
longitudinal magnetic field in xi^1 CMa (=-87 +/- 2 G in 2019 and =-207
+/- 3 G in 2020), as well as the results of ongoing monitoring of the star's
Halpha variability. We examine evidence for deviation from a purely dipolar
topology. We also report a new HST UV spectrum of xi^1 CMa obtained near
magnetic null that is consistent with an equatorial view of the magnetosphere,
as evidenced by its similarity to the UV spectrum of beta Cep obtained near
maximum emission. The new UV spectrum of xi^1 CMa provides additional evidence
for the extremely long rotation period of this star via comparison to archival
data.Comment: 13 pages, Accepted 2021 May 14 to Monthly Notices of the Royal
Astronomical Society 202
New observations of NGC 1624-2 reveal a complex magnetospheric structure and underlying surface magnetic geometry
No evidence of a sudden change of spectral appearance or magnetic field strength of the O9.7V star HD 54879
The magnetic early B-type stars:III. A main-sequence magnetic, rotational, and magnetospheric biography
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