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; A. ud-Doula

doi:10.1093/mnras/stt323

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, A. ud-Doula

Penn State Scranton

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

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 (P_rot = 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 language	English (US)
Pages (from-to)	2253-2260
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	431
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stt323
State	Published - May 2013

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stt323

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title = "Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612",

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.",

author = "Marcolino, {W. L.F.} and Bouret, {J. C.} and Sundqvist, {J. O.} and Walborn, {N. R.} and Fullerton, {A. W.} and Howarth, {I. D.} and Wade, {G. A.} and A. ud-Doula",

year = "2013",

month = may,

doi = "10.1093/mnras/stt323",

language = "English (US)",

volume = "431",

pages = "2253--2260",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press",

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T1 - Phase-resolved ultraviolet spectroscopy of the magnetic of? P star HD 191612

AU - Marcolino, W. L.F.

AU - Bouret, J. C.

AU - Sundqvist, J. O.

AU - Walborn, N. R.

AU - Fullerton, A. W.

AU - Howarth, I. D.

AU - Wade, G. A.

AU - ud-Doula, A.

PY - 2013/5

Y1 - 2013/5

N2 - 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.

AB - 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.

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U2 - 10.1093/mnras/stt323

DO - 10.1093/mnras/stt323

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

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

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