J/A+A/555/A83ivo://CDS.VizieR/J/A+A/555/A83doi:10.26093/cds/vizier.35550083CDSNaze Y.Rauw G.Sana H.Corcoran M.F.2023-07-24T15:14:09Z2013-07-04T13:25:55ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesUsing XMM-Newton data, we study for the first time the X-ray emission of HM1 and IC2944/2948. Low-mass, pre-main sequence objects with an age of a few Myr are detected, as well as a few background or foreground objects. Most massive stars in both clusters display the usual high-energy properties of that kind of objects, though with log(Lx/Lbol) apparently lower in HM1 than in IC2944/2948. Comparing with studies of other clusters, it seems that low S/N at soft energies, due to the high extinction, may the main cause of this difference. In HM1, the two Wolf-Rayet stars show contrasting behaviours: WR89 is extremely bright, but much softer than WR87. It remains to be seen whether wind-wind collisions or magnetically confined winds can explain such emissions. In IC2944/2948, the X-ray sources concentrate around HD101205; a group of massive stars to the north of this object appears rather isolated, suggesting that there exist two subclusters in the field-of-view.2013A&A...555A..83Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/555/A83CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2013)B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)VII/239 : History and Accurate Positions for the NGC/IC Objects (Corwin, 2004)VII/101 : Star Clusters/Associations. III. Open Clusters (Ruprecht+ 1983)J/A+AS/146/251 : Open clusters absolute proper motions. I. (Baumgardt+, 2000)J/A+A/371/908 : Havlen-Moffat No. 1 UBVRI photometry (Vazquez+, 2001)J/A+A/388/168 : Absolute proper motions of 93 open clusters (Dias+, 2002)J/AJ/125/1397 : Kinematics, age and abundances of open clusters (Chen+, 2003)J/ApJS/161/118 : byH{alpha} photometry in open clusters (McSwain+, 2005)J/ApJ/648/591 : Stellar rotation in young clusters. II. (Huang+, 2006)J/ApJ/648/580 : Rotational velocities in 19 open clusters (Huang+, 2006)J/AJ/131/1559 : Diameters of Galactic open clusters (van den Bergh+, 2006)J/AN/328/889 : Mean Radial Velocities of open clusters (Kharchenko+, 2007)J/MNRAS/416/817 : RV catalog of O-type stars in IC 2944 & Cen OB2 (Sana+, 2011)J/A+A/548/A97 : Catalogue of variable stars in open clusters (Zejda+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/555/A83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/555/A83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/555/A83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/555/A83https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/555/A83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/555/A83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/555/A83/table1 (Parameters of the detected X-ray sources in HM1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/555/A83/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/555/A83/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/555/A83/table1?GETtext/xml+votable180.050000true259.7524-38.814050.005555555555555556Cone search capability for table J/A+A/555/A83/table3 (Parameters of detected X-ray sources in IC2944/2948)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/555/A83/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/555/A83/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/555/A83/table3?GETtext/xml+votable180.050000true174.58342917-63.372788890.0055555555555555566/37894 37897 37900 42436 42438https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/555/A83?format=asciiX-raydefaultJ/A+A/555/A83/table1Parameters of the detected X-ray sources in HM1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVB[1/440]? Number in VB catalog (2)meta.id.crossintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar2MASSName of 2MASS counterpartmeta.id.crosscharXID[1/58] Identifiermeta.id;meta.mainintRAJ2000X-ray Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000X-ray Declination (J2000)pos.eq.dec;meta.mainCm1? Count rate for MOS1 (0.3-10keV) (G1)ct/ksphot.count;em.X-rayfloatnullablee_Cm1? Error on MOS1 count ratect/ksstat.errorfloatnullableu_Cm1Uncertainty flag on Cm1 (G1)meta.code.errorcharCm2? Count rate for MOS2 (0.3-10keV) (G1)ct/ksphot.count;em.X-rayfloatnullablee_Cm2? Error on MOS2 count ratect/ksstat.errorfloatnullableu_Cm2Uncertainty flag on Cm2 (G1)meta.code.errorcharCpn? Count rate for pn (0.3-10keV) (G1)ct/ksphot.count;em.X-rayfloatnullablee_Cpn? Error on pn count ratect/ksstat.errorfloatnullableu_CpnUncertainty flag on Cpn (G1)meta.code.errorcharHR1[-1/1]? Hardness Ratio M/S for pn (G2)phot.flux;arith.ratiofloatnullablee_HR1? Error on HR1stat.errorfloatnullableHR2[-1/1]? Hardness Ratio H/M for pn (G2)meta.notefloatnullablee_HR2? Error on HR2stat.errorfloatnullableDist1? Distance from VB counterpart (2)arcsecpos.angDistancefloatnullableDist2? Distance from 2MASS counterpartarcsecpos.angDistancefloatnullableComAdditional informations (other name, spectral type)meta.notecharu_XID[?] Uncertainty flag on XID (1)meta.code.errorcharJ/A+A/555/A83/table3Parameters of detected X-ray sources in IC2944/2948XID[1/368] Identifiermeta.id;meta.mainintprimaryu_XID[? ext] Uncertainty flag on XID (1)meta.code.errorcharHR1? Hardness Ratio M/S for pn (G2)phot.flux;arith.ratiofloatnullablee_HR1? Error on HR1stat.errorfloatnullableHR2? Hardness Ratio H/M for pn (G2)meta.notefloatnullablee_HR2? Error on HR2stat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharOO indicates an optical/IR counterpart in table4meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000X-ray Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000X-ray Declination (J2000)pos.eq.dec;meta.mainRACCorrected right ascension (J2000) (2)pos.eq.raDECCorrected declination (J2000) (2)pos.eq.decCm1? Count rate for MOS1 (G1)ct/ksphot.count;em.X-rayfloatnullablee_Cm1? Error on MOS1 count ratect/ksstat.errorfloatnullableCm2? Count rate for MOS2 (G1)ct/ksphot.count;em.X-rayfloatnullablee_Cm2? Error on MOS2 count ratect/ksstat.errorfloatnullableCpn? Count rate for pn (G1)ct/ksphot.count;em.X-rayfloatnullablee_Cpn? Error on pn count ratect/ksstat.errorfloatnullableJ/A+A/555/A83/table4Counterparts of the X-ray sources of IC2944/2948recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXID[1/367] Identifiermeta.id;meta.mainintf_XID[+] More than one 2MASS counterpart (1)meta.codecharDist1Distance from 2MASS counterpartarcsecpos.angDistancefloat2MASSName of 2MASS counterpartmeta.id.crosscharDist2? Distance from MG counterpart (2)arcsecpos.angDistancefloatnullableMG[8/110]? Number in MG catalog (2)meta.id.crossintnullableEWHa? Equivalent width of H{alpha} in MG catalog (2)0.1nmspect.line.eqWidthfloatnullableDist3? Distance from Simbad counterpartarcsecpos.angDistancefloatnullableSNameName of Simbad counterpartmeta.id.crosscharComAdditional informations (sp. type, period...) (3)meta.notechar