J/AN/319/215ivo://CDS.VizieR/J/AN/319/215doi:10.26093/cds/vizier.113190215CDSProsser C.F.Randich S.Simon T.2025-09-29T20:17:12Z2003-03-27T05:54:53ZCDS support team

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

cds-question@unistra.fropen-star-clustersphotometryx-ray-sourcesThe present investigation examines possible optical counterparts to 130 X-ray sources in the region of the alpha Persei open cluster (d~170pc, age~50Myr) resulting from the analysis of three 22-25ksec ROSAT PSPC pointings. In the same manner as for 73 X-ray sources from a raster survey in alpha Per (Prosser & Randich, 1998, Cat. <J/AN/319/201>), CCD photometry is employed to obtain magnitudes and colors for stars/objects close to the X-ray positions, with additional echelle and low-dispersion Halpha spectra provided for some stars. For almost 60 X-ray sources, an optical counterpart with photometry acceptable for cluster membership is identified, some of which can be excluded from membership on the basis of discrepant radial velocity or X-ray characteristics. On the order of 30 new members or likely members associated with X-ray sources have been identified based on available data. A photometric rotation period has been obtained for one rapid rotator identified in X-rays.1998AN....319..215Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AN/319/215CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AN/319/201 : Alpha Per cluster low-mass members. I. (Prosser+, 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AN/319/215https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AN/319/215http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AN/319/215https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AN/319/215https://vizier.iucaa.in/viz-bin/votable?-source=J/AN/319/215http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AN/319/215GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AN/319/215/table1 (Recovered APX X-ray sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/319/215/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/319/215/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/319/215/table1?GETtext/xml+votable180.050000true50.22549.4658330.005555555555555556Cone search capability for table J/AN/319/215/table2 (PSPC APX X-ray source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/319/215/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/319/215/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/319/215/table2?GETtext/xml+votable180.050000true50.09416748.9769440.005555555555555556Cone search capability for table J/AN/319/215/table4 (Members/Candidate members associated with X-ray sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/319/215/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/319/215/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/319/215/table4?GETtext/xml+votable180.050000true50.09791748.9761110.0055555555555555565/784 6/1771 1774 3093 3095 3140 3144-3145https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AN/319/215?format=asciiX-rayOpticaldefaultJ/AN/319/215/table1Recovered APX X-ray sourcesl_HRLimit flag on HRmeta.code.errorcharHRHardness ratio (2)phot.flux;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPX[1/203] APX (Alpha Per, X-ray) numbermeta.id;meta.mainintprimaryf_APX[a] Note on APX 5 (1)meta.code.errorcharn_APX[*] Note in appena.dat filemeta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainMLhHardband Maximum Likelihood valuestat.likelihoodfloatExpEffective exposure timestime.duration;obs.exposureintCountRate? PSCP count rates**-1phot.count;em.X-rayfloatnullablen_CountRate[)] ): estimated hardband count ratemeta.notechare_CountRate? rms uncertainty on CountRates**-1stat.errorfloatnullableOffaxOff-axisarcmininstr.offsetfloatPSPCPSPC field (only in table1.dat)obs.fieldcharJ/AN/319/215/table2PSPC APX X-ray source listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPX[1/203] APX (Alpha Per, X-ray) numbermeta.id;meta.mainintprimaryf_APX[a] Note on APX 5 (1)meta.code.errorcharn_APX[*] Note in appena.dat filemeta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainMLhHardband Maximum Likelihood valuestat.likelihoodfloatExpEffective exposure timestime.duration;obs.exposureintCountRate? PSCP count rates**-1phot.count;em.X-rayfloatnullablen_CountRate[)] ): estimated hardband count ratemeta.notechare_CountRate? rms uncertainty on CountRates**-1stat.errorfloatnullableOffaxOff-axisarcmininstr.offsetfloatl_HRLimit flag on HRmeta.code.errorcharHRHardness ratio (2)phot.flux;arith.ratiofloatPSPCPSPC field (only in table1.dat)obs.fieldcharJ/AN/319/215/table4Members/Candidate members associated with X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPX? APX numbermeta.id;meta.mainintnullablem_APXMultiplicity index on APXmeta.code.multipcharn_APX[*] Membership note (1)meta.notecharNameOther namemeta.idcharRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination (2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-IKV-I_K_ colour indexmagphot.color;em.opt.V;em.opt.Ifloatu_V-IKrms uncertainty on V-IKmeta.code.errorcharMem[YN ?] Membershipmeta.code.membercharB-V0B-V_0_ colour indexmagphot.color;em.opt.B;em.opt.Vfloatu_B-V0rms uncertainty on B-V0meta.code.errorcharlogLX? X-ray luminositylog(solLum)phys.luminosity;em.X-rayfloatnullablelogLbolBolometric luminositylog(solLum)phys.luminosityfloatlog(LX/Lbol)? X-ray to bolometric luminosity ratiophys.luminosity;arith.ratiofloatnullableNotesNotesmeta.notecharJ/AN/319/215/appenaIndividual notes on the finding chartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPXAPX numbermeta.id;srcintNoteText of the notemeta.notecharJ/AN/319/215/table7Optical counterparts to X-ray sourcesMem[YN ?] Membershipmeta.code.membercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPX[75/203]+= APX numbermeta.id;meta.mainintm_APXMultiplicity index on APXmeta.code.multipcharu_APXUncertainty flag on APXmeta.code.errorcharVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-IK? V-I_K_ colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullable