A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879

Переведенное название: Короткое и внезапное увеличение напряженности магнитного поля и сопровождающая его спектральная переменность звезды O9.7 V HD 54879

S. Hubrig, M. Küker , S.P. Järvinen , A.F. Kholtygin, M. Schöller, E.B. Ryspaeva, D.D. Sokoloff

Результат исследований: Научные публикации в периодических изданияхстатья

1 цитирование (Scopus)

Выдержка

Only 11 O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a '600 G longitudinal magnetic field in the O9.7 V star HD 54879 with a lower limit of the dipole strength of 1/42 kG was discovered a few years ago in the framework of the ESO large program 'B-fields in OB stars'. Our FORS 2 spectropolarimetric observations from 2017 October 4 to 2018 February 21 reveal the presence of short- and long-term spectral variability and a gradual magnetic field decrease from about '300 G down to about '90 G. Surprisingly, we discover on the night of 2018 February 17 a sudden, short-term increase of the magnetic field strength and measure a longitudinal magnetic field of '833 G. The inspection of the FORS 2 spectrum acquired during the observed magnetic field increase indicates a very strong change in spectral appearance with a significantly lower photospheric temperature and a decrease of the radial velocity by several 10 km s '1. Different scenarios are discussed in an attempt to interpret our observations. Our FORS 2 radial velocity measurements indicate that HD 54879 is a member of a long-period binary.

Язык оригиналаанглийский
Страницы (с-по)4495-4506
ЖурналMonthly Notices of the Royal Astronomical Society
Том484
Номер выпуска4
Ранняя дата в режиме онлайн18 янв 2019
DOI
СостояниеОпубликовано - 21 апр 2019

Отпечаток

field strength
magnetic field
stars
magnetic fields
radial velocity
European Southern Observatory
velocity measurement
night
inspection
dipoles

Предметные области Scopus

  • Астрономия и астрофизика
  • Космические науки и планетоведение

Цитировать

Hubrig, S. ; Küker , M. ; Järvinen , S.P. ; Kholtygin, A.F. ; Schöller, M. ; Ryspaeva, E.B. ; Sokoloff, D.D. / A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879. В: Monthly Notices of the Royal Astronomical Society. 2019 ; Том 484, № 4. стр. 4495-4506.
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abstract = "Only 11 O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a '600 G longitudinal magnetic field in the O9.7 V star HD 54879 with a lower limit of the dipole strength of 1/42 kG was discovered a few years ago in the framework of the ESO large program 'B-fields in OB stars'. Our FORS 2 spectropolarimetric observations from 2017 October 4 to 2018 February 21 reveal the presence of short- and long-term spectral variability and a gradual magnetic field decrease from about '300 G down to about '90 G. Surprisingly, we discover on the night of 2018 February 17 a sudden, short-term increase of the magnetic field strength and measure a longitudinal magnetic field of '833 G. The inspection of the FORS 2 spectrum acquired during the observed magnetic field increase indicates a very strong change in spectral appearance with a significantly lower photospheric temperature and a decrease of the radial velocity by several 10 km s '1. Different scenarios are discussed in an attempt to interpret our observations. Our FORS 2 radial velocity measurements indicate that HD 54879 is a member of a long-period binary.",
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A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879. / Hubrig, S.; Küker , M.; Järvinen , S.P.; Kholtygin, A.F.; Schöller, M. ; Ryspaeva, E.B.; Sokoloff, D.D.

В: Monthly Notices of the Royal Astronomical Society, Том 484, № 4, 21.04.2019, стр. 4495-4506.

Результат исследований: Научные публикации в периодических изданияхстатья

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T1 - A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879

AU - Hubrig, S.

AU - Küker , M.

AU - Järvinen , S.P.

AU - Kholtygin, A.F.

AU - Schöller, M.

AU - Ryspaeva, E.B.

AU - Sokoloff, D.D.

PY - 2019/4/21

Y1 - 2019/4/21

N2 - Only 11 O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a '600 G longitudinal magnetic field in the O9.7 V star HD 54879 with a lower limit of the dipole strength of 1/42 kG was discovered a few years ago in the framework of the ESO large program 'B-fields in OB stars'. Our FORS 2 spectropolarimetric observations from 2017 October 4 to 2018 February 21 reveal the presence of short- and long-term spectral variability and a gradual magnetic field decrease from about '300 G down to about '90 G. Surprisingly, we discover on the night of 2018 February 17 a sudden, short-term increase of the magnetic field strength and measure a longitudinal magnetic field of '833 G. The inspection of the FORS 2 spectrum acquired during the observed magnetic field increase indicates a very strong change in spectral appearance with a significantly lower photospheric temperature and a decrease of the radial velocity by several 10 km s '1. Different scenarios are discussed in an attempt to interpret our observations. Our FORS 2 radial velocity measurements indicate that HD 54879 is a member of a long-period binary.

AB - Only 11 O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a '600 G longitudinal magnetic field in the O9.7 V star HD 54879 with a lower limit of the dipole strength of 1/42 kG was discovered a few years ago in the framework of the ESO large program 'B-fields in OB stars'. Our FORS 2 spectropolarimetric observations from 2017 October 4 to 2018 February 21 reveal the presence of short- and long-term spectral variability and a gradual magnetic field decrease from about '300 G down to about '90 G. Surprisingly, we discover on the night of 2018 February 17 a sudden, short-term increase of the magnetic field strength and measure a longitudinal magnetic field of '833 G. The inspection of the FORS 2 spectrum acquired during the observed magnetic field increase indicates a very strong change in spectral appearance with a significantly lower photospheric temperature and a decrease of the radial velocity by several 10 km s '1. Different scenarios are discussed in an attempt to interpret our observations. Our FORS 2 radial velocity measurements indicate that HD 54879 is a member of a long-period binary.

KW - MHD

KW - stars: atmospheres

KW - stars: early-type

KW - stars: individual: HD 54879

KW - stars: magnetic field

KW - stars: variables: general

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JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

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