J/MNRAS/459/880ivo://CDS.VizieR/J/MNRAS/459/880doi:10.26093/cds/vizier.74590880CDSMarco A.Negueruela I.2024-08-16T20:17:05Z2016-06-03T08:12:10ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomymedium-band-photometryWe study the area around the HII region Sh 2-234, including the young open cluster Stock 8, to investigate the extent and definition of the association Aur OB2 and the possible role of triggering in massive cluster formation. We obtained Stromgren and J, H, Ks photometry for Stock 8 and Stromgren photometry for two other cluster candidates in the area, which we confirm as young open clusters and name Alicante 11 and Alicante 12. We took spectroscopy of ~33 early-type stars in the area, including the brightest cluster members. We calculate a common distance of 2.80+0.27-0.24kpc for the three open clusters and surrounding association. We derive an age 4-6Ma for Stock 8, and do not find a significantly different age for the other clusters or the association. The star LS V +34 23, with spectral type O8 II(f), is likely the main source of ionization of Sh 2-234. We observe an important population of pre-main-sequence stars, some of them with discs, associated with the B-type members lying on the main sequence. We interpret the region as an area of recent star formation with some residual and very localized ongoing star formation. We do not find evidence for sequential star formation on a large scale. The classical definition of Aur OB2 has to be reconsidered, because its two main open clusters, Stock 8 and NGC 1893, are not at the same distance. Stock 8 is probably located in the Perseus arm, but other nearby HII regions whose distances also place them in this arm show quite different distances and radial velocities and, therefore, are not connected.2016MNRAS.459..880Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/459/880CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/459/880https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/459/880http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/459/880https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/459/880https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/459/880http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/459/880GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/459/880/stock8 (Coordinates, 2MASS (tablea1) and Stromgren (tablea3) photometry for stars in the cluster Stock 8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/880/stock8?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/880/stock8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/880/stock8?GETtext/xml+votable180.050000true81.965916734.51336110.005555555555555556Cone search capability for table J/MNRAS/459/880/tablea2 (Near IR photometry taken by us for stars in the cluster Stock 8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/880/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/880/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/880/tablea2?GETtext/xml+votable180.050000true82.003458334.37908330.005555555555555556Cone search capability for table J/MNRAS/459/880/ali11 (Coordinates, 2MASS (tablea4) and Stromgren (tablea5) photometry for stars in the new cluster Alicante 11)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/880/ali11?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/880/ali11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/880/ali11?GETtext/xml+votable180.050000true81.981166734.839250.005555555555555556Cone search capability for table J/MNRAS/459/880/ali12 (Coordinates, 2MASS (tablea6) and Stromgren (tablea7) photometry for stars in the new cluster Alicante 11)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/880/ali12?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/880/ali12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/880/ali12?GETtext/xml+votable180.050000true82.072208334.86583330.0055555555555555566/1297 12997.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/459/880?format=asciiOpticalInfrareddefaultJ/MNRAS/459/880/stock8Coordinates, 2MASS (tablea1) and Stromgren (tablea3) photometry for stars in the cluster Stock 8recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSTIdentification of the star with optical photometry in the cluster Stock 8meta.id;meta.mainintSTIR? The identification of the star with our near IR photometry in the cluster Stock 8 (1)meta.idintnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J magnitude (2)magphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmag (2)magstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitude (2)magphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmag (2)magstat.error;phot.mag;em.IR.HfloatnullableKsmag? 2MASS Ks magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmag (2)magstat.error;phot.mag;em.IR.KfloatnullableVmagV-band magnitudemagphot.mag;em.opt.Bfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatn_Vmag[*] Note on Vmag (G1)meta.notecharb-yStromgren b-y colour indexmagphot.color;em.opt.B;em.opt.Vfloate_b-yrms uncertainty on b-ymagstat.error;phot.color;em.opt.Bfloatn_b-y[*] Note on b-y (G1)meta.notecharc1Stromgren c1 indexmagphot.colorfloate_c1rms uncertainty on c1magstat.errorfloatn_c1[*] Note on c1 (G1)meta.notecharo_VmagNumber of measurements for V, b-y and c1meta.numberintm1Stromgren m1 indexmagphot.colorfloate_m1rms uncertainty on m1magstat.errorfloatn_m1[*] Note on m1 (G1)meta.notecharo_m1Number of measurements for m1meta.numberintbeta? beta indexmagphot.colorfloatnullablee_beta? rms uncertainty on beta indexmagstat.errorfloatnullablen_beta[*] Note on beta (G1)meta.notecharo_betaNumber of measurements for betameta.numberintJ/MNRAS/459/880/tablea2Near IR photometry taken by us for stars in the cluster Stock 8recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStindicates data in table stock8meta.ref.urlcharSTIRThe identification of the star with our near IR photometry in the cluster Stock 8meta.idintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmagJ magnitude (1)magphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmag (1)magstat.error;phot.mag;em.IR.JfloatHmagH magnitude (1)magphot.mag;em.IR.Hfloate_Hmagrms uncertainty on Hmag (1)magstat.error;phot.mag;em.IR.HfloatKsmagKs magnitude (1)magphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmag (1)magstat.error;phot.mag;em.IR.KfloatJ/MNRAS/459/880/ali11Coordinates, 2MASS (tablea4) and Stromgren (tablea5) photometry for stars in the new cluster Alicante 11recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAlicante11The identification of the star with optical photometry in the cluster Alicante 11meta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatnullableVmagV-band magnitudemagphot.mag;em.opt.Bfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatb-yStromgren b-y colour indexmagphot.color;em.opt.B;em.opt.Vfloate_b-yrms uncertainty on b-ymagstat.error;phot.color;em.opt.Bfloatn_b-y[*] Note on b-y (G1)meta.notecharm1Stromgren m1 indexmagphot.colorfloate_m1rms uncertainty on m1magstat.errorfloatn_m1[*] Note on m1 (G1)meta.notecharc1Stromgren c1 indexmagphot.colorfloate_c1rms uncertainty on c1magstat.errorfloatn_c1[*] Note on c1 (G1)meta.notecharbetabeta indexmagphot.colorfloate_betarms uncertainty on beta indexmagstat.errorfloatn_beta[*] Note on beta (G1)meta.notecharo_VmagNumber of measurements for each magnitude, colour and indexmeta.numberintJ/MNRAS/459/880/ali12Coordinates, 2MASS (tablea6) and Stromgren (tablea7) photometry for stars in the new cluster Alicante 11recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAlicante12The identification of the star with optical photometry in the cluster Alicante 12meta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag2MASS H magnitudemagphot.mag;em.IR.Hfloate_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag2MASS Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatVmagV-band magnitudemagphot.mag;em.opt.Bfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatb-yStromgren b-y colour indexmagphot.color;em.opt.B;em.opt.Vfloate_b-yrms uncertainty on b-ymagstat.error;phot.color;em.opt.Bfloatn_b-y[*] Note on b-y (G1)meta.notecharm1Stromgren m1 indexmagphot.colorfloate_m1rms uncertainty on m1magstat.errorfloatn_m1[*] Note on m1 (G1)meta.notecharc1Stromgren c1 indexmagphot.colorfloate_c1rms uncertainty on c1magstat.errorfloatn_c1[*] Note on c1 (G1)meta.notecharbetabeta indexmagphot.colorfloate_betarms uncertainty on beta indexmagstat.errorfloatn_beta[*] Note on beta (G1)meta.notecharo_VmagNumber of measurements for each magnitude, colour and indexmeta.numberint