J/AJ/145/95ivo://CDS.VizieR/J/AJ/145/95doi:10.26093/cds/vizier.51450095CDSThompson G.B.Morrison N.D.2018-01-31T06:09:53Z2014-04-24T15:30:29ZCDS support team

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

cds-question@unistra.frline-intensitiesradial-velocityearly-type-starsvariable-starsWe present the results of a time series analysis of 130 echelle spectra of {epsilon} Ori (B0 Ia), acquired over seven observing seasons between 1998 and 2006 at Ritter Observatory. The equivalent widths of H{alpha} (net) and HeI{lambda}5876 were measured and radial velocities were obtained from the central absorption of HeI{lambda}5876. Temporal variance spectra (TVS) revealed significant wind variability in both H{alpha} and HeI{lambda}5876. The HeI TVS have a double-peaked profile consistent with radial velocity oscillations. A periodicity search was carried out on the equivalent width and radial velocity data, as well as on wavelength-binned spectra. This analysis has revealed several periods in the variability with timescales of two to seven days. Many of these periods exhibit sinusoidal modulation in the associated phase diagrams. Several of these periods were present in both H{alpha} and HeI, indicating a possible connection between the wind and the photosphere. Due to the harmonic nature of these periods, stellar pulsations may be the origin of some of the observed variability. Periods on the order of the rotational period were also detected in the HeI line in the 1998-1999 season and in both lines during the 2004-2005 season. These periods may indicate rotational modulation due to structure in the wind.2013AJ....145...95Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/145/95CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)III/254 : 2nd Catalog of RVs with Astrometric Data (Kharchenko+, 2007)III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)V/125 : Photometry and Spectroscopy for Luminous Stars (Reed 2005)III/244 : Catalog of Stellar Rotational Velocities (Glebocki+ 2005)V/53 : Catalogue of the Brightest Stars (Ochsenbein+ 1988)V/17 : A list of Supergiant Stars (Egret 1980)J/ApJS/161/154 : Near-IR spectral atlas of OB stars (Hanson+, 2005)J/A+A/384/473 : O, B and Be stars equivalent widths (Lenorzer+, 2002)J/ApJ/573/359 : Rotational velocities of B stars from BSC (Abt+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/145/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/145/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/145/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/145/95https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/145/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/145/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/145/95/table3Summary of observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeasonObserving season (1998-1999 to 2005-2006)time.epochcharprimaryNs[10/26] Number of spectrameta.numberintdt[6/16.5] Average interval between observationsdtime.interval;obsfloatT[115/205] Total span of the time seriesdtime.epochintPer1[2/121]? Period of variability in HeI detected through first run (1)dtime.periodfloatnullablePer2[2.1/9]? Period of variability in HeI detected through second run (1)dtime.periodfloatnullablePer3[2.8/16]? Period of variability in HeI detected through third run (1)dtime.periodfloatnullableVCShow the Radial Velocity curvesmeta.ref.urlcharJ/AJ/145/95/table4Equivalent width and HeI radial velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeasonObserving seasontime.epochcharHJDHeliocenric Julian Date; HJD-2450000dtime.epochdoubleW(Ha)? Equivalent width of H{alpha} line ({AA})0.1nmspect.line.eqWidthfloatnullableW(HeI)? Equivalent width of HeI 5876{AA} line ({AA})0.1nmspect.line.eqWidthfloatnullableRV[-17/22.2] Radial velocitykm/sphys.veloc;pos.heliocentricfloat