2017
DOI: 10.1051/0004-6361/201630016
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First constraints on the magnetic field strength in extra-Galactic stars: FORS2 observations of Of?p stars in the Magellanic Clouds

Abstract: Massive O-type stars play a dominant role in our Universe, but many of their properties remain poorly constrained. In the last decade magnetic fields have been detected in all Galactic members of the distinctive Of?p class, opening the door to a better knowledge of all O-type stars. With the aim of extending the study of magnetic massive stars to nearby galaxies, to better understand the role of metallicity in the formation of their magnetic fields and magnetospheres, and to broaden our knowledge of the role o… Show more

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Cited by 14 publications
(13 citation statements)
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“…This may reflect an incomplete characterization of the sample of magnetic O-type stars. Many such systems have been found to be spectroscopic binaries, leading to an increase in the inferred surface magnetic field strength (e.g., ζ Ori Aa and HD 148937; Blazère et al 2015;Wade et al 2019); B d is still a lower limit for the extremely slow rotator HD 108 (Shultz & Wade 2017); and while magnetic fields have still not been detected in the magellanic cloud Of?p stars (Walborn et al 2015;Bagnulo et al 2017), preliminary models of their magnetospheric variability suggest the mean B d of this population to be about 7 kG (Munoz et al 2018), consistent with that of the Galactic magnetic AB stars.…”
Section: Dipolar Magnetic Field Strengthsmentioning
confidence: 99%
“…This may reflect an incomplete characterization of the sample of magnetic O-type stars. Many such systems have been found to be spectroscopic binaries, leading to an increase in the inferred surface magnetic field strength (e.g., ζ Ori Aa and HD 148937; Blazère et al 2015;Wade et al 2019); B d is still a lower limit for the extremely slow rotator HD 108 (Shultz & Wade 2017); and while magnetic fields have still not been detected in the magellanic cloud Of?p stars (Walborn et al 2015;Bagnulo et al 2017), preliminary models of their magnetospheric variability suggest the mean B d of this population to be about 7 kG (Munoz et al 2018), consistent with that of the Galactic magnetic AB stars.…”
Section: Dipolar Magnetic Field Strengthsmentioning
confidence: 99%
“…The classification criteria come from Walborn et al (2010a) and describes Of-type stars whose C iii λ4650 emission is comparable in intensity to the N iii λλ4634, 42 emission. Of?p stars are also highly magnetic (Munoz et al 2018;Bagnulo et al 2017) and are believed to be oblique magnetic rotators (Walborn et al 2010a). A spectrum of the discovered Of?p star is shown in Figure 2.…”
Section: Strange Of-type Starsmentioning
confidence: 99%
“…and P = 7.9606 ± 0.0009d. This ephemeris is sufficiently precise to allow us to phase our new EWs with those of Bagnulo et al (2017). The resultant phase curves, illustrated in Fig.…”
Section: Lmc 164-2mentioning
confidence: 97%
“…In Paper I, we demonstrate that the EWs of Hβ and He ii λ4686 varied smoothly according to this same period. Using the most recent epochs of OGLE photometry, we derived a new ephemeris for SMC 159-2, with T 0 = 2457416.997 and P = 14.915 ± 0.003 d. This ephemeris is sufficiently precise to allow us to phase our new EWs, measured from He ii 4686, Hβ and Hα, with those of Bagnulo et al (2017). The resultant phase curves, illustrated in Fig.…”
Section: Smc 159-2mentioning
confidence: 99%
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