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<ri:Resource created="1997-12-09T20:02:30Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>OB Associations and Spiral Structure in M33</title><shortName>J/AJ/105/499</shortName><identifier>ivo://CDS.VizieR/J/AJ/105/499</identifier><altIdentifier>doi:10.26093/cds/vizier.51050499</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Regan M.W.</name></creator><creator><name>Wilson C.D.</name></creator><date role="Updated">2023-04-06T16:49:27Z</date><date role="Created">1997-12-09T20:02:30Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><description>This file contains UBV photometry for the brightest stars in the southern spiral arm of M33. All stars brighter than V=21 are included in this file. For details on the observations and data reduction see reference. All the data is in ASCII format of the file. 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Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>U</name><description>? U band Magnitude (blank if undetermined)</description><unit>mag</unit><ucd>phot.mag;em.opt.U</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>e_U</name><description>? U uncertainty (blank if undetermined)</description><unit>mag</unit><ucd>stat.error;pos.cartesian.x</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>U-B</name><description>? U-B Magnitude (blank if undetermined)</description><unit>mag</unit><ucd>phot.color;em.opt.U;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ass</name><description>[22/58]? 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