J/A+A/616/A40ivo://CDS.VizieR/J/A+A/616/A40doi:10.26093/cds/vizier.36160040CDSCorti M.A.Orellana R.B.Bosch G.L.2019-11-26T06:31:20Z2018-08-13T12:52:33ZCDS support team

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

cds-question@unistra.fropen-star-clustersvisible-astronomyWide-band photometryob-starsWe plan to identify the members of the Bochum 7 association by performing simultaneous astrometric and spectrophotometric analyses, and estimate its distance and evolutionary stage. We used our own visual spectroscopic and UBV photometric data of a 30{deg}x30{deg} region centered at RA=8:44:47.2, DE=-45:58:55.5. This information enabled us to estimate the spectral classification and distance of all stars present in the region. The proper motion was analyzed with data of the UCAC 5 catalog and was used to identify the members of this association. We added JHK data from 2MASS and IRAS catalogs to check for the presence of infrared (IR) excess stars. We found that Bochum 7 is an OB association with at least 27 identified stellar members (l=265.12{deg}, b=-2{deg}) at a distance of ~=5640pc. Its proper motion is pm_RA_cosDE=-4.92+/-0.08mas/yr, pm_DE_=3.26+/-0.08mas/yr. We derived an average heliocentric radial velocity of ~35km/s and were able to confirm the binary nature of the (ALS 1135) system and detect four new binary star candidates. Analysis of data for massive Bo 7 star candidates points towards a young age (<=3x10^6^ years old) for the association, although the presence of a previous episode of star formation remains to be analyzed.2018A&A...616A..40Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/616/A40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/616/A40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/616/A40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/616/A40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/616/A40https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/616/A40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/616/A40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/616/A40/table3 (Candidates proposed as members of Bochum 7)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/616/A40/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/616/A40/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/616/A40/table3?GETtext/xml+votable180.050000true131.46825-46.102890.0055555555555555566/35377 35379https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/616/A40?format=asciiOpticaldefaultJ/A+A/616/A40/table3Candidates proposed as members of Bochum 7recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintRAJ2000Right ascension in decimal hours (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatBmagB magnitudemagphot.mag;em.opt.BfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatQReddening-free parameter Qmagphot.color.reddFreefloat