J/ApJ/901/91ivo://CDS.VizieR/J/ApJ/901/91doi:10.26093/cds/vizier.19010091CDSTorres G.2022-10-04T12:12:50Z2022-02-18T12:31:17ZCDS support team

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

cds-question@unistra.frradial-velocityearly-type-starsspectroscopic-binary-starsstellar-spectral-typesvisible-astronomyRadial velocities for the early-type stars in the Pleiades cluster have always been challenging to measure because of the significant rotational broadening of the spectral lines. The large scatter in published velocities has led to claims that many are spectroscopic binaries, and in several cases, preliminary orbital solutions have been proposed. To investigate these claims, we obtained and report here velocity measurements for 33 rapidly rotating B, A, and early F stars in the Pleiades region, improving significantly on the precision of the historical velocities for most objects. With one or two exceptions, we do not confirm any of the previous claims of variability, and we also rule out all four of the previously published orbital solutions, for HD 22637, HD 23302, HD 23338, and HD 23410. We do find HD 22637 to be a binary but with a different period (71.8d). HD 23338 is likely a binary as well, with a preliminary 8.7yr period also different from the one published. Additionally, we report a 3635d orbit for HD 24899, another new spectroscopic binary in the cluster. From the 32 bona fide members in our sample, we determine a mean radial velocity for the Pleiades of 5.79+/-0.24km/s, or 5.52+/-0.31km/s when objects with known visual companions are excluded. Adding these astrometric binaries to the new spectroscopic ones, we find a lower limit to the binary fraction among the B and A stars of 37%. In addition to the velocities, we measure vsini for all stars, ranging between 69 and 317km/s.2020ApJ...901...91Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/901/91CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)II/131 : Tonantzintla Pleiades Flare Stars (Haro+ 1982)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)III/279 : RAVE 5th data release (Kunder+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)J/A+A/329/101 : Masses of Pleiades members (Raboud+ 1998)J/A+AS/144/469 : Delta Scuti stars (Rodriguez+, 2000)J/A+A/368/912 : Polarization & rot. velocities of Be stars (Yudin, 2001)J/ApJ/573/359 : Rotational velocities of B stars from BSC (Abt+, 2002)J/AJ/124/1144 : Orbits of 171 single-lined sp. binaries (Latham, 2002)J/A+A/393/897 : Rotational velocities of A-type stars II. (Royer+, 2002)J/A+A/440/305 : Fundamental param. of fast-rotating B stars (Fremat+, 2005)J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)J/A+A/498/949 : Veloc. of F-K dwarfs in open clusters (Mermilliod+, 2009)J/MNRAS/424/1925 : Spectrocopic Binarity of O and B type stars (Chini+, 2012)J/other/A+ARV/20.51 : Rapidly rotating stars (Van Belle, 2012)J/A+A/537/A120 : Rotational velocities of A-type stars. IV. (Zorec+, 2012)J/MNRAS/458/2307 : gamma Dor stars sp. survey (Kahraman Alicavus+, 2016)J/A+A/595/A132 : Be star rotational velocities distribution (Zorec+, 2016)J/A+A/597/A22 : Massive O- and B-type stars velocities (Simon-Diaz+, 2017)J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diag. (Gaia Collaboration, 2018)J/A+A/623/A72 : Binarity of HIP stars from Gaia pm anomaly (Kervella+, 2019)J/AJ/157/196 : Close companions around young stars (Kounkel+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/901/91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/901/91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/901/91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/901/91https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/901/91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/901/91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/901/91/sample (Stars in our (Table 1), rotational velocities (Table 6) and summary of radial velocity results (Table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/901/91/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/901/91/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/901/91/sample?GETtext/xml+votable180.050000true52.816458325.25547220.0055555555555555566/451 455-456 459-461 463-464 467 472 474 478 487 492 496 499https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/901/91?format=asciiOpticaldefaultJ/ApJ/901/91/sampleStars in our (Table 1), rotational velocities (Table 6) and summary of radial velocity results (Table 3)NameStar namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharONameOther namemeta.idcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainSpTSpectral type from SIMBADsrc.spTypecharvsiniRotational velocity from this work from Table 6km/sphys.veloc.rotatinte_vsiniVsini uncertaintykm/sstat.error;phys.veloc.rotatintVPInteractive velocity Plotmeta.ref.urlcharf_Name[*] * = see notes in the textmeta.codecharNobs[5/32] Number of observationsmeta.numberintS/N[54/352] Average signal-to-noise ratio per resolution elementpos.angResolution;stat.meanintHJD1Heliocentric Julian Date start of observation; HJD1-2400000dtime.epochintHJD2Heliocentric Julian Date end of observation HJD2-2400000dtime.epochintSpan[324/3394] Time spandtime.intervalintRV[3.78/9.41] Average radial velocity, <RV>km/sspect.dopplerVeloc;stat.meanfloate_RV[0.07/2.8] standard deviation of the velocity (1)km/sstat.errorfloatRVp[4.2/7.2]? Predicted radial velocity (2)spect.dopplerVelocfloatnullableSep[0.0019/3.5]? Angular separation of the pairarcsecpos.angDistancefloatnullablef_Sep[*] Flag on Sep (3)meta.codecharDmag[0/6.1]? Magnitude difference of the pairmagphot.mag;arith.difffloatnullableBin[1/8]? Binarity reference (4)meta.bibintnullableLitVelocity variability from the literature or published orbital solutions (5)meta.notecharJ/ApJ/901/91/table2Heliocentric radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharHJD[55107/58894.7] Heliocentric Julian Date; HJD-2400000dtime.epochdoubleRVel[-19.99/19.6] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RVel[0.32/6.74] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloat