Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612

W. L.F. Marcolino, J. C. Bouret, J. O. Sundqvist, N. R. Walborn, A. W. Fullerton, I. D. Howarth, G. A. Wade, Asif Ud-Doula

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We present for the first time phase-resolved ultraviolet (UV) spectroscopy of an Ofp star, namely, HD 191612. The observations were acquired with the Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telescope (HST). We report the variability observed in the main photospheric and wind features and compare the results with previous findings for the Of?p star HD 108. We show that UV line strengths, Ha, and longitudinal magnetic field, vary coherently according to the rotational period (Prot = 537.6 d), providing additional support for the magnetic oblique rotator scenario. The stellar and wind parameters of HD 191612 are obtained based on NLTE expanding atmosphere models. The peculiar wind line profile variations revealed by the new STIS data - not reproduced by 1D atmosphere models - are addressed through non-spherical magnetohydrodynamical simulations coupled with radiative transfer. The basic aspects of the UV variability observed are explained and the structure of the dynamical magnetosphere of HD 191612 is discussed.

Original languageEnglish (US)
Pages (from-to)2253-2260
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume431
Issue number3
DOIs
StatePublished - May 1 2013

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ultraviolet spectroscopy
spectroscopy
stars
spectrographs
telescopes
atmospheres
atmosphere
Hubble Space Telescope
magnetospheres
radiative transfer
magnetosphere
magnetic field
profiles
magnetic fields
simulation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Marcolino, W. L. F., Bouret, J. C., Sundqvist, J. O., Walborn, N. R., Fullerton, A. W., Howarth, I. D., ... Ud-Doula, A. (2013). Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612. Monthly Notices of the Royal Astronomical Society, 431(3), 2253-2260. https://doi.org/10.1093/mnras/stt323
Marcolino, W. L.F. ; Bouret, J. C. ; Sundqvist, J. O. ; Walborn, N. R. ; Fullerton, A. W. ; Howarth, I. D. ; Wade, G. A. ; Ud-Doula, Asif. / Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 431, No. 3. pp. 2253-2260.
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Marcolino, WLF, Bouret, JC, Sundqvist, JO, Walborn, NR, Fullerton, AW, Howarth, ID, Wade, GA & Ud-Doula, A 2013, 'Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612', Monthly Notices of the Royal Astronomical Society, vol. 431, no. 3, pp. 2253-2260. https://doi.org/10.1093/mnras/stt323

Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612. / Marcolino, W. L.F.; Bouret, J. C.; Sundqvist, J. O.; Walborn, N. R.; Fullerton, A. W.; Howarth, I. D.; Wade, G. A.; Ud-Doula, Asif.

In: Monthly Notices of the Royal Astronomical Society, Vol. 431, No. 3, 01.05.2013, p. 2253-2260.

Research output: Contribution to journalArticle

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Marcolino WLF, Bouret JC, Sundqvist JO, Walborn NR, Fullerton AW, Howarth ID et al. Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612. Monthly Notices of the Royal Astronomical Society. 2013 May 1;431(3):2253-2260. https://doi.org/10.1093/mnras/stt323