J/A+A/411/565ivo://CDS.VizieR/J/A+A/411/565doi:10.26093/cds/vizier.34110565CDSNeiner C.Henrichs H.F.Floquet M.Fremat Y.Preuss O.Hubert A.M.,Geers V.C.Tijani A.H.Nichols J.Jankov S.2004-03-05T20:19:48Z2004-03-05T21:19:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starsmagnetic-fieldsV2052 Oph is a {beta} Cep star with vsini~60km/s. The behavior of its stellar wind was studied in the ultraviolet wavelength region with the IUE satellite. It revealed periodic variations in the equivalent widths (EW) of the resonance lines of wind-sensitive ions with a period of 3.638833d, which is identified as the rotational period. These variations are typical of magnetic stars. Therefore time-resolved circular spectropolarimetric observations were obtained with the Musicos echelle spectropolarimeter at the 2-m Telescope Bernard Lyot (TBL) to search for a magnetic field in the star. Stokes V patterns were observed, the inclination and magnetic angles were derived and a value was determined for the polar magnetic field (250+/-190G) using an oblique rotator dipole model. The spectroscopic information was used to search for periodicity in line-profile variations (lpv), radial velocity and minimum intensity curves. Multiperiodicity was found, corresponding to radial (f1=7.15c/d) and non-radial (f2=6.82c/d, l=3 or 4) pulsation modes. The rotation period is also detected in rotationally modulated observables because of the magnetic poles passing through the observer's line of sight. We determined the stellar parameters of the star, which was found to be chemically peculiar, in particular He-enriched. This makes V2052 Oph the first magnetic He-strong early B star with known pulsational properties.2003A&A...411..565Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/411/565CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/134 : Catalog of Magnetic Field Measurements (Didelon 1983)J/A+A/409/275 : Rotation and magnetic field in omega Ori (Neiner+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/411/565https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/411/565http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/411/565https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/411/565https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/411/565http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/411/565GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/411/565/table7Longitudinal magnetic field measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential number of the measurementmeta.idintHJDHeliocentric Julian date of measurementdtime.epochfloatPhase[0,1[ Phase (with P = 3.638833 d)time.phasefloatBLongitudinal field measurement0.0001Tphys.magFieldinte_Brms uncertainty on B0.0001Tstat.errorintNNull polarisation (1)0.0001Tinstr.skyLevelfloate_Nrms uncertainty on N0.0001Tstat.errorint