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The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927. / Yakunin, I.; Wade, G.; Bohlender, D.; Kochukhov, O.; Marcolino, W.; Shultz, M.; Monin, D.; Grunhut, J.; Sitnova, T.; Tsymbal, V.

в: Monthly Notices of the Royal Astronomical Society, Том 447, № 2, 21.02.2015, стр. 1418-1438.

Результаты исследований: Научные публикации в периодических изданияхстатьяРецензирование

Harvard

Yakunin, I, Wade, G, Bohlender, D, Kochukhov, O, Marcolino, W, Shultz, M, Monin, D, Grunhut, J, Sitnova, T & Tsymbal, V 2015, 'The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927', Monthly Notices of the Royal Astronomical Society, Том. 447, № 2, стр. 1418-1438. https://doi.org/10.1093/mnras/stu2401

APA

Yakunin, I., Wade, G., Bohlender, D., Kochukhov, O., Marcolino, W., Shultz, M., Monin, D., Grunhut, J., Sitnova, T., & Tsymbal, V. (2015). The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927. Monthly Notices of the Royal Astronomical Society, 447(2), 1418-1438. https://doi.org/10.1093/mnras/stu2401

Vancouver

Yakunin I, Wade G, Bohlender D, Kochukhov O, Marcolino W, Shultz M и пр. The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927. Monthly Notices of the Royal Astronomical Society. 2015 Февр. 21;447(2):1418-1438. https://doi.org/10.1093/mnras/stu2401

Author

Yakunin, I. ; Wade, G. ; Bohlender, D. ; Kochukhov, O. ; Marcolino, W. ; Shultz, M. ; Monin, D. ; Grunhut, J. ; Sitnova, T. ; Tsymbal, V. / The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927. в: Monthly Notices of the Royal Astronomical Society. 2015 ; Том 447, № 2. стр. 1418-1438.

BibTeX

@article{a827c55d1225446ca37b453515c1126a,
title = "The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927",
abstract = "A new time series of high-resolution Stokes I and V spectra of the magnetic B2V star HD 184927 has been obtained in the context of the Magnetism in Massive Stars Large Program with an Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) spectropolarimeter at the Canada-France-Hawaii Telescope and dimaPol liquid crystal spectropolarimeter at 1.8-m telescope of Dominion Astrophysical Observatory. We model the optical and UV spectrum obtained from the International Ultraviolet Explorer (IUE) archive to infer the stellar physical parameters. Using magnetic field measurements, we derive an improved rotational period of 9.531 02 ± 0.0007 d. We infer the longitudinal magnetic field from lines of H, He, and various metals, revealing large differences between the apparent field strength variations determined from different elements. Magnetic Doppler Imaging using He and O lines yields strongly non-uniform surface distributions of these elements. We demonstrate that the diversity of longitudinal field variations can be understood as due to the combination of element-specific surface abundance distributions in combination with a surface magnetic field that is comprised of dipolar and quadrupolar components. We have reanalysed IUE high-resolution spectra, confirming strong modulation of wind-sensitive C IV and S IV resonance lines. However, we are unable to detect any modulation of the Hα profile attributable to a stellar magnetosphere. We conclude that HD 184927 hosts a centrifugal magnetosphere (η~ 2.4+22-1.1 × 104), albeit one that is undetectable at optical wavelengths. The magnetic braking time-scale of HD 184927 is computed to be τ J = 0.96 or 5.8 Myr. These values are consistent with the slow rotation and estimated age of the star.",
keywords = "Chemically peculiar - stars, HD 184927 - stars, Individual, Magnetic field, Stars",
author = "I. Yakunin and G. Wade and D. Bohlender and O. Kochukhov and W. Marcolino and M. Shultz and D. Monin and J. Grunhut and T. Sitnova and V. Tsymbal",
year = "2015",
month = feb,
day = "21",
doi = "10.1093/mnras/stu2401",
language = "English",
volume = "447",
pages = "1418--1438",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Wiley-Blackwell",
number = "2",

}

RIS

TY - JOUR

T1 - The surface magnetic field and chemical abundance distributions of the B2V helium-strong star HD 184927

AU - Yakunin, I.

AU - Wade, G.

AU - Bohlender, D.

AU - Kochukhov, O.

AU - Marcolino, W.

AU - Shultz, M.

AU - Monin, D.

AU - Grunhut, J.

AU - Sitnova, T.

AU - Tsymbal, V.

PY - 2015/2/21

Y1 - 2015/2/21

N2 - A new time series of high-resolution Stokes I and V spectra of the magnetic B2V star HD 184927 has been obtained in the context of the Magnetism in Massive Stars Large Program with an Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) spectropolarimeter at the Canada-France-Hawaii Telescope and dimaPol liquid crystal spectropolarimeter at 1.8-m telescope of Dominion Astrophysical Observatory. We model the optical and UV spectrum obtained from the International Ultraviolet Explorer (IUE) archive to infer the stellar physical parameters. Using magnetic field measurements, we derive an improved rotational period of 9.531 02 ± 0.0007 d. We infer the longitudinal magnetic field from lines of H, He, and various metals, revealing large differences between the apparent field strength variations determined from different elements. Magnetic Doppler Imaging using He and O lines yields strongly non-uniform surface distributions of these elements. We demonstrate that the diversity of longitudinal field variations can be understood as due to the combination of element-specific surface abundance distributions in combination with a surface magnetic field that is comprised of dipolar and quadrupolar components. We have reanalysed IUE high-resolution spectra, confirming strong modulation of wind-sensitive C IV and S IV resonance lines. However, we are unable to detect any modulation of the Hα profile attributable to a stellar magnetosphere. We conclude that HD 184927 hosts a centrifugal magnetosphere (η~ 2.4+22-1.1 × 104), albeit one that is undetectable at optical wavelengths. The magnetic braking time-scale of HD 184927 is computed to be τ J = 0.96 or 5.8 Myr. These values are consistent with the slow rotation and estimated age of the star.

AB - A new time series of high-resolution Stokes I and V spectra of the magnetic B2V star HD 184927 has been obtained in the context of the Magnetism in Massive Stars Large Program with an Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) spectropolarimeter at the Canada-France-Hawaii Telescope and dimaPol liquid crystal spectropolarimeter at 1.8-m telescope of Dominion Astrophysical Observatory. We model the optical and UV spectrum obtained from the International Ultraviolet Explorer (IUE) archive to infer the stellar physical parameters. Using magnetic field measurements, we derive an improved rotational period of 9.531 02 ± 0.0007 d. We infer the longitudinal magnetic field from lines of H, He, and various metals, revealing large differences between the apparent field strength variations determined from different elements. Magnetic Doppler Imaging using He and O lines yields strongly non-uniform surface distributions of these elements. We demonstrate that the diversity of longitudinal field variations can be understood as due to the combination of element-specific surface abundance distributions in combination with a surface magnetic field that is comprised of dipolar and quadrupolar components. We have reanalysed IUE high-resolution spectra, confirming strong modulation of wind-sensitive C IV and S IV resonance lines. However, we are unable to detect any modulation of the Hα profile attributable to a stellar magnetosphere. We conclude that HD 184927 hosts a centrifugal magnetosphere (η~ 2.4+22-1.1 × 104), albeit one that is undetectable at optical wavelengths. The magnetic braking time-scale of HD 184927 is computed to be τ J = 0.96 or 5.8 Myr. These values are consistent with the slow rotation and estimated age of the star.

KW - Chemically peculiar - stars

KW - HD 184927 - stars

KW - Individual

KW - Magnetic field

KW - Stars

UR - http://www.scopus.com/inward/record.url?scp=84922569592&partnerID=8YFLogxK

U2 - 10.1093/mnras/stu2401

DO - 10.1093/mnras/stu2401

M3 - Article

AN - SCOPUS:84922569592

VL - 447

SP - 1418

EP - 1438

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -

ID: 126870101