J/MNRAS/482/4174ivo://CDS.VizieR/J/MNRAS/482/4174doi:10.26093/cds/vizier.74824174CDSFeast M.W.Griffin R.F.Herbig G.H.Whitelock P.A.2024-08-19T20:15:03Z2018-12-27T14:18:51ZCDS support team

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

cds-question@unistra.frvariable-starspeculiar-variable-starsline-intensitiesradial-velocityRadial-velocity observations made on more than a thousand nights are presented for the type star of the R Coronae Borealis (RCB) class. There are four principal sources: the Lick Observatory (1950 to 1953), the original Cambridge radial-velocity spectrometer (1968 to 1991), and the Haute-Provence and Cambridge Coravels (1986 to 1998 and 1997 to 2007, respectively). In the case of the last set the size (equivalent width) and width (expressed as if Vsin(i)) of the Coravel cross-correlation (dip) profiles are also given, and the variation and complexity of those profiles are discussed. Although there is often evidence of cyclical behaviour in radial velocity, no coherent periodicity is found in any of the series. From time to time, and especially over 100 days before the great decline of 2007, the atmosphere was highly disturbed, with evidence of high-velocity components. We suggest that those are associated with large turbulent elements and result in mass ejection to sufficient distances for the formation of soot and other solids and thus the initiation of RCB-type declines. We associate the changes in light and radial velocity near maximum light primarily with the combined effect of such turbulent elements, and not with coherent pulsation. There is some evidence for a variation in the mean radial velocity on a time scale of about ten thousand days.2019MNRAS.482.4174Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/482/4174CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/353/287 : The R CrB stars (Asplund+, 2000)J/AJ/134/1877 : Spectropolarimetry of R CrB in 1998-2003 (Kawabata+, 2007)J/ApJ/747/102 : ^12^C/^13^C ratio for 18 galactic R CrB stars (Hema+, 2012)J/A+A/539/A51 : Catalogue enriched with R CrB stars (Tisserand, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/482/4174https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/482/4174http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/482/4174https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/482/4174https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/482/4174http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/482/4174GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/MNRAS/482/4174/tablea1Lick radial velocitiesNote[0.5] 0.5=underexposedmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatJ/MNRAS/482/4174/tablea2Various radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleNote[o] =o faintmeta.notecharHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatObsID? Observatory codemeta.id;instr.obstyintnullableJ/MNRAS/482/4174/tablea3Coravel radial velocities and widthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatEW? strength of dipkm/sspect.line.eqWidthfloatnullableVsini? width of dipkm/sphys.veloc.rotatfloatnullableNote[ox] =o faint, =x abnormalmeta.notechar