J/A+A/560/A30ivo://CDS.VizieR/J/A+A/560/A30doi:10.26093/cds/vizier.35600030CDSZharikov S.Miroshnichenko A.S.Pollmann E.Danford S.Bjorkman K.S.,Morrison N.D.Favaro A.Guarro Flo J.Terry J.N.Desnoux V.Garrel T.,Martineau G.Buchet Y.Ubaud S.Mauclaire B.Kalbermatten H.Buil C.,Sawicky C.J.Blank T.Garde O.2017-06-12T08:25:24Z2013-12-02T08:46:00ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsbe-starsspectroscopyThe work is aimed at studying the circumstellar disk of the bright classical binary Be star pi Aqr. We analysed variations of a double-peaked profile of the Halpha emission line in the spectrum of pi Aqr that was observed in many phases during ~40 orbital cycles in 2004-2013. We applied the discrete Fourier transform (DFT) method to search for periodicity in the peak intensity ratio (V/R). Doppler tomography was used to study the structure of the disk around the primary. The dominant frequency in the power spectrum of the Halpha V/R ratio is 0.011873d^-1^, which corresponds to a period of 84.2(2) days and agrees with the earlier determined orbital period of the system P_orb_=84.1d. The V/R shows a sinusoidal variation that is phase-locked with the orbital period. Doppler maps of all our spectra show a non-uniform structure of the disk around the primary: a ring with the inner and outer radii at V_in_~450km/s and V_out_~200km/s, respectively, along with an extended stable region (spot) at V_x_~225km/s and Vy~100km/s. The disk radius of ~65R_{sun}_=0.33AU was estimated by assuming Keplerian motion of a particle on a circular orbit at the disk's outer edge.2013A&A...560A..30Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/560/A30CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/709/1306 : Spectropolarimetry of 60 Cyg and {pi} Aqr (Wisniewski+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/560/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/560/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/560/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/560/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/560/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/560/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/560/A30/table1The dates of observations of {pi} Aqr, the source, and measurements of the H{alpha} emission linerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date of observation (2004-08-22 to 2013-10-05)dtime.epochdoubleV/RH{alpha} Violet/Red intensity ratio (V/R=I_V_/I_R_)spect.line.intensity;em.line.Halpha;arith.ratiofloatEWHa? H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableRef[1/3] Reference of the observation (1)meta.refintspPlot of the spectrummeta.ref.urlcharFileNameName of the FITS spectrum in subdirectory "spectra"meta.id;meta.fitscharfitsDownload the corresponding FITS spectrummeta.ref.urlchar