J/A+A/546/A92ivo://CDS.VizieR/J/A+A/546/A92doi:10.26093/cds/vizier.35460092CDSGamen R.Arias J.I.Barba R.H.Morrell N.I.Walborn N.R.Sota A.,Maiz Apellaniz J.Alfaro E.J.2018-03-01T12:26:28Z2013-05-07T08:21:17ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsspectroscopyradial-velocityWe report the detection of a shell-like event in the Oe-type star HD 120678. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and HeI absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of OII, SiIII and FeIII. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.2012A&A...546A..92Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/546/A92CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/546/A92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/546/A92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/546/A92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/546/A92https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/546/A92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/546/A92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/546/A92defaultJ/A+A/546/A92/table2Radial velocities of some lines measured in the spectra of HD 120678recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubleV5411? Radial velocity of HeII5411 absorption linekm/sphys.veloc;pos.heliocentricfloatnullableV4686? Radial velocity of HeII4686 absorption linekm/sphys.veloc;pos.heliocentricfloatnullableV5875b? Radial velocity of the violet component of the HeI5875 emission linekm/sphys.veloc;pos.heliocentricfloatnullableV5875r? Radial velocity of the red component of the HeI5875 emission emission linekm/sphys.veloc;pos.heliocentricfloatnullableJ/A+A/546/A92/spectraList of spectra (wavelength range: 446/470nm)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsDateObservation datetime.epoch;obsnullableFileNameName of the FITS file with spectrum, in subdirectory spmeta.id;meta.fitscharAssocDataAssociated Data web pagemeta.bib.pagecharspspectrum plotmeta.ref.urlcharDownloadDownload the FITS filemeta.ref.urlchar