The magnetic variability of the $\beta$~Cep star ${\xi }^1$\,CMa

Abstract

${\xi }^1$ CMa is a known magnetic star showing rotationally modulated magnetic variability with a period of 2.17937 d. However, recent work based on high-resolution spectropolarimetry suggests that the rotation period is longer than 30 years. We compare our new spectropolarimetric measurements with FORS 2 at the VLT acquired on three consecutive nights in 2017 to previous FORS 1/2 measurements of the longitudinal magnetic field strength. The new longitudinal magnetic field values are in the range from 115 to 240 G and do not support the presence of a long period.

arXiv comment5 pages, 4 figures, 1 table

References in corpus (19)

• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• Abundance analysis of prime B-type targets for asteroseismology I. Nitrogen excess in slowly-rotating beta Cephei stars
• Discovery of magnetic fields in the beta Cephei star xi^1 CMa and in several Slowly Pulsating B stars
• Nitrogen enrichment, boron depletion and magnetic fields in slowly-rotating B-type dwarfs
• B fields in OB stars (BOB): low-resolution FORS2 spectropolarimetry of the first sample of 50 massive stars
• Detection of a weak surface magnetic field on Sirius A: are all tepid stars magnetic ?
• Measurements of magnetic fields over the pulsation cycle in six roAp stars with FORS1 at the VLT
• New measurements of magnetic fields of roAp stars with FORS1 at the VLT
• Multisite spectroscopic seismic study of the beta Cep star V2052 Oph: inhibition of mixing by its magnetic field
• New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars
• Exploring the origin of magnetic fields in massive stars: A survey of O-type stars in clusters and in the field
• The applications of the MHD Alfven wave oscillation model for kHz quasi-periodic oscillations
• Evolution of Magnetic Fields in Stars Across the Upper Main Sequence: II. Observed distribution of the magnetic field geometry
• Asteroseismology and Oblique Pulsator Model of Beta Cephei
• First magnetic field models for recently discovered magnetic beta Cephei and slowly pulsating B stars
• Short time scale spectral variability in the A0 supergiant HD92207 and the importance of line profile variations for the interpretation of FORS2 spectropolarimetric observations
• The pulsating magnetosphere of the extremely slowly rotating magnetic $\beta$ Cep star ${\xi }^1$ CMa
• Weak magnetic fields in central stars of planetary nebulae?
• The challenge of measuring magnetic fields in strongly pulsating stars: the case of HD 96446

Cited by in corpus (1)

• Confirmation of xi^1 CMa's ultra-slow rotation: magnetic polarity reversal and a dramatic change in magnetospheric UV emission lines