J/A+AS/146/323ivo://CDS.VizieR/J/A+AS/146/323CDSNeuhaeuser R.Walter F.M.Covino E.Alcala J.M.Wolk S.J.Frink S.,Guillout P.Sterzik M.F.Comeron F.2023-05-26T14:59:40Z2000-11-18T21:45:24ZCDS support team

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

cds-question@unistra.frx-ray-sourcespre-main-sequence-starsinfrared-photometryvisible-astronomyphotometryradial-velocityWe present the ROSAT All-Sky Survey data in a 126 deg^2^ area in and around the CrA star forming region. With low-resolution spectroscopy of unidentified ROSAT sources we could find 19 new pre-main sequence stars, two of which are classical T Tauri stars, the others being weak-lined. The spectral types of these new T Tauri stars range from F7 to M6. The two new classical T Tauri stars are located towards two small cloud-lets outside of the main CrA cloud. They appear to be ~10 Myrs old, by comparing their location in the H-R diagram with isochrones for an assumed distance of 130 pc, the distance of the main CrA dark cloud. The new off-cloud weak-line T Tauri stars may have formed in similar cloudlets, which have dispersed recently. High-resolution spectra of our new T Tauri stars show that they have significantly more lithium absorption than zero-age main-sequence stars of the same spectral type, so that they are indeed young. From those spectra we also obtained rotational and radial velocities. For some stars we found the proper motion in published catalogs. The direction and velocity of the 3D space motion - south relative to the galactic plane - of the CrA T Tauri stars is consistent with the dark cloud being formed originally by a high-velocity cloud impact onto the galactic plane, which triggered the star formation in CrA. We also present VRIJHK photometry for most of the new T Tauri stars to derive their luminosities, ages, and masses.2000A&AS..146..323Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/146/323CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)J/A+A/297/391 : T Tauri stars ROSAT survey (Neuhaeuser+, 1995)J/A+A/341/L79 : Proper motions of faint ROSAT WTT stars (Terranegra+ 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/146/323https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/146/323http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/146/323https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/146/323https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/146/323http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/146/323GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/146/323/table2 (*X-ray data for our sample.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/146/323/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/146/323/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/146/323/table2?GETtext/xml+votable180.050000true278.783333-34.0722220.005555555555555556Cone search capability for table J/A+AS/146/323/table3 (*Optical counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/146/323/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/146/323/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/146/323/table3?GETtext/xml+votable180.050000true278.775833-34.0674440.005555555555555556ROSAT5/11927 11954-11958 11961 11964 11968-11970 11977 11980 6/47534 47703 47719 47725-47726 47729-47731 47734-47737 47739-47740 47742-47743 47773 47775 47809 47813-47814 47837 47841 47853 47866 47884 47886-47887 47896 47898-47899 47902 47904-47905 47907 47912-47913 47915-47916 47918-47919 47924 47928 47930 48001-48002 48004-48005 48008-48009https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/146/323?format=asciiX-rayOpticalInfrareddefaultJ/A+AS/146/323/table2*X-ray data for our sample.e_Countsrms uncertainty on Countsctstat.error;phot.countfloatExpExposition timestime.duration;obs.exposurefloatCountsNumber of counts in the broad band (0.1 to 2.4KeV)ctphot.countfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NWC2000]Sequential numbermeta.idintprimaryRXJRXJ designation (based on J2000)meta.id;meta.maincharRAJ2000X-ray right ascension (J2000)pos.eq.ra;meta.mainDEJ2000X-ray declination sign (J2000)pos.eq.dec;meta.mainMLMaximum likelihood of existencestat.likelihoodfloatl_HR1[=>< ] Limit flag on HR1meta.code.errorcharHR1Hardness ratio 1 (1)phot.flux;arith.ratiofloate_HR1? rms uncertainty on HR1stat.errorfloatnullablel_HR2[=>< ] Limit flag on HR2meta.code.errorcharHR2? Hardness ratio 2 (1)phot.flux;arith.ratiofloatnullablee_HR2? rms uncertainty on HR2stat.errorfloatnullablelogECFEnergy conversion factor in counts (in erg^-1^cm^2^)log(1e+07cm**2.J**-1)arith.factor;phot.countfloatJ/A+AS/146/323/table3*Optical counterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NWC2000]Sequential numbermeta.idintRAJ2000Optical right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Optical declination (J2000)pos.eq.dec;meta.mainDeltaOffset between X-ray and optical positionarcsecpos;arith.diffintVmag? V magnitudemagphot.mag;em.opt.Vfloatnullableu_VmagUncertainty flag on Vmagmeta.code.errorcharlog(FX/FV)? X-ray to optical flux ratiophot.flux;arith.ratiofloatnullableOptID[pyzend] Nature on the counterpart (1)meta.id.assoccharRemRemarks (2)meta.notecharNote[1/2]? Notes (3)meta.noteintnullableJ/A+AS/146/323/table4New T Tauri stars in CrAEWLiLithium equivalent width (1)0.1nmspect.line.eqWidthfloatu_EWLi[:] : when EWLi not from high-resolution spectrameta.code.errorcharvsini? Rotational velocitykm/sphys.veloc.rotatfloatnullableHRV? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablelogLXX-ray luminosity (2)log(1e-07W)phys.luminosity;em.X-rayfloatRemRemarksmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NWC2000]Sequential numbermeta.idintRXJRXJ designationmeta.id;meta.maincharm_RXJ[NE SW] Multiplicity index in RXJmeta.code.multipcharPMSPMS type (wTTS or cTTS)src.classcharSpTypeSpectral typesrc.spTypecharEWHaH{alpha} equivalent width (1)0.1nmspect.line.eqWidthfloatu_EWHa[:] : when EWHa not from high-resolution spectrameta.code.errorcharNote[1/5]? Notes (3)meta.noteintnullableJ/A+AS/146/323/table5Photometric data for new T Tauri stars in CrA.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NWC2000]Sequential number (1)intm_[NWC2000][NE SW] Multiplicity index on SeqcharBmag? B magnitudemagfloatnullableu_BmagUncertainty flag on Bmag (2)charVmagV magnitudemagfloatu_VmagUncertainty flag on Vmag (2)chare_Bmag? rms uncertainty on BmagmagfloatnullableV-R? V-R colour indexmagfloatnullablee_V-R? rms uncertainty on V-RmagfloatnullableR-I? R-I colour indexmagfloatnullablee_R-I? rms uncertainty on R-ImagfloatnullableKmag? K magnitudemagfloatnullablee_Kmag? rms uncertainty on KmagmagfloatnullableJ-K? J-K colour index (3)magfloatnullablee_J-K? rms uncertainty on J-KmagfloatnullableH-K? H-K colour index (3)magfloatnullablee_H-K? rms uncertainty on H-KmagfloatnullableAVmagAbsorption in V bandmagfloatLogLbolBolometric luminosity (4)log(solLum)floatAgeAge (5)MyrfloatMassMass (5)solMassfloat