astro-ph.SR; astro-ph.HE; Space and Planetary Science; Astronomy and Astrophysics
Abstract :
[en] We analyse optical and X-ray spectroscopy of the Of?p star HD108, known for
its strong dipolar magnetic field and its optical line profile variability with
a timescale of $54 \pm 3$ yrs, interpreted as the stellar rotation period.
Optical emission lines have now recovered from their minimum emission state
reached in 2007 - 2008. The variations of the equivalent width of the H$\alpha$
emission provide constraints on the inclination of the rotation axis ($i$) and
the obliquity of the magnetic axis ($\beta$). The best agreement between model
and observations is found for ($i$, $\beta$) pairs with $i + \beta \simeq
85^{\circ}$ and $i \in [30^{\circ},55^{\circ}]$. The Balmer emission lines
display stochastic variability at the $\sim 5$ % level on timescales of a few
days. TESS photometry unveils transient modulations on similar timescales in
addition to prominent red noise variations. A Chandra X-ray observation of
December 2021, when the star was at a higher emission level, indicates a slight
increase of the flux and a spectral hardening compared to the August 2002
XMM-Newton observation, taken near minimum emission state. Magnetohydrodynamic
simulations are used to compute synthetic X-ray spectra. With our current best
estimate of the $\dot{M}_{B=0}$ mass-loss rate, the simulated X-ray luminosity
and spectral energy distribution agree very well with the observations.
Finally, the radial velocities vary on a period of 8.5 years with a
peak-to-peak amplitude of 10 - 11 km s$^{-1}$, suggesting orbital motion with
an unseen companion of at least 4 M$_{\odot}$.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Nazé, Yaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
ud-Doula, Asif ; Penn State Scranton , 120 Ridge View Drive, Dunmore, PA 18512, USA
Neiner, Coralie ; LESIA, Paris Observatory, PSL University, CNRS, Sorbonne University, Université de Paris Cité , 5 Place Jules Janssen, Meudon 92195, France
Language :
English
Title :
Diving into the magnetosphere of the Of?p star HD108
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