Towards an understanding of the Of?p star HD191612: Phase-resolved multiwavelength observations

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dc.creatorNaze, Yael
dc.creatorRauw, Gregor
dc.creatorPollock, A. M. T.
dc.creatorWalborn, Nolan R.
dc.creatorHowarth, Ian D.
dc.date2006-11-07
dc.date.accessioned2026-07-07T11:20:39Z
dc.date.available2026-07-07T11:20:39Z
dc.descriptionWe present the analysis of phase-resolved X-ray and optical observations of the peculiar hot star HD191612 (Of?p). This star is known to display line-profile variations that are recurrent with a period of 538d and its spectrum was found to present the signature of a magnetic field. In the X-rays, it is slightly overluminous compared to the canonical L_X/L_BOL relation and appears brighter when the optical lines are strongest. Our XMM-Newton observations further reveal that the X-ray spectrum of \hd exhibits rather broad lines and is dominated by a `cool' (0.2-0.6 keV) thermal component, two characteristics at odds with the proposed magnetic rotator model. We also report for the first time the low-level variability of the metallic (abs/em) lines and HeII absorptions that appear to be associated with radial-velocity shifts. Finally, we compare our results with observations of the early-type stars and discuss several possible scenarios.
dc.description10p, 10 fig, accepted for publication in MNRAS (www.blackwell-synergy.com)
dc.identifierhttps://arxiv.org/abs/astro-ph/0611230
dc.identifierhttp://arxiv.org/abs/astro-ph/0611230
dc.identifierMon.Not.Roy.Astron.Soc.375:145-153,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11270.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194027
dc.subjectAstrophysics
dc.titleTowards an understanding of the Of?p star HD191612: Phase-resolved multiwavelength observations
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