J/A+A/459/849ivo://CDS.VizieR/J/A+A/459/849doi:10.26093/cds/vizier.34590849CDSKoubsky P.Harmanec P.Yang S.Netolicky M.Skoda P.Slechta M.,Korcakova D.2017-06-22T14:29:30Z2008-01-22T12:13:27ZCDS support team

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

cds-question@unistra.frbe-starsradial-velocityBinaries observed in the initial rapid phase of mass exchange between the components are very rare since the statistical probability of finding them is low. At the same time, thorough studies of them are extremely important for better understanding the process of large-scale mass exchange and possible mass loss from the system. One of these objects is probably upsilon Sgr. By analyzing 35 new electronic spectra and numerous published spectral and photometric observations, we derived the new orbital elements, an upper limit to a secular period change, and also the peculiar RV curve of the blue-shifted H{alpha} absorption. Possible models of the binary and its evolutionary stage are then discussed critically.2006A&A...459..849Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/459/849CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/324/965 : UBV photometry of V360 Lac. Paper 17. (Hill+ 1997)J/A+A/328/551 : Spectroscopic data of 4 Herculis. Paper 18. (Koubsky+ 1997)J/A+A/387/580 : UBV photometry of V832 Cyg. Paper 21. (Harmanec+, 2002)J/A+A/416/669 : UBV photometry of HD 6226. Paper 22. (Bozic+, 2004)J/A+A/419/607 : Long-term variations of kappa Dra. Paper 23. (Saad+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/459/849https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/459/849http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/459/849https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/459/849https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/459/849http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/459/849GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/459/849/table2Individual radial velocities of ups Sgr observations from several stationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleRVRadial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatWeightWeight of the data pointstat.weight;phys.atmol.weightfloatObsCode for observatory and spectrograph (1)meta.codeintComp[1/2] Binary componentmeta.code.multipint