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<ri:Resource created="1997-12-09T16:35:45Z" status="active" updated="2025-06-13T15:25:00Z" 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>MK Standard Stars</title><shortName>III/149</shortName><identifier>ivo://CDS.VizieR/III/149</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Garcia B.</name></creator><date role="Updated">2013-02-26T11:56:56Z</date><date role="Created">1997-12-09T16:35:45Z</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><subject>morgan-keenan-classification</subject><subject>stellar-spectral-types</subject><subject>standard-stars</subject><description>The purpose of the present work is to provide a complete list of MK standard stars, selected from the main papers related to this subject, according to the recommendations of both authors of the MK system. The catalogue provides a list of 963 standard stars, with their spectral type, luminosity, equatorial coordinates, magnitudes, colour index (B-V), and references. The magnitude and colours were taken from Mermillod (1986) UBV Photoelectric Photometry Catalogue (catalog &lt;II/122&gt;). In the cases without observations with the UBV catalogue, the apparent magnitude was taken from the SIMBAD data-base (SIMBAD is described at &lt;http://cdsweb.u-strasbg.fr/Simbad.html&gt;)</description><source format="bibcode">1989BICDS..36...27G</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/III/149</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=III/149</accessURL><mirrorURL title="VizieR at IUCAA: Pune, 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standardID="ivo://ivoa.net/std/ConeSearch"><description>Cone search capability for table III/149/catalog (The catalogue)</description><interface xsi:type="vs:ParamHTTP" role="std"><accessURL use="base">https://vizier.cds.unistra.fr/viz-bin/conesearch/III/149/catalog?</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/conesearch/III/149/catalog?</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/conesearch/III/149/catalog?</mirrorURL><queryType>GET</queryType><resultType>text/xml+votable</resultType></interface><maxSR>180.0</maxSR><maxRecords>50000</maxRecords><verbosity>true</verbosity><testQuery><ra>98.05147029</ra><dec>4.82927739</dec><sr>0.005555555555555556</sr></testQuery></capability><coverage><spatial>6/15 79 137 155 248 254 297 320 337 341 377 428 463 472 474 496 546 684 689 737 754 841 859 894 903 905 915 938 989 998 1015 1018 1032 1143 1198 1249 1286 1287 1293 1297 1341 1360 1385 1399 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Bright Star &lt;V/50&gt; number</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>m_HR</name><description>Multiplicity index on HR number</description><ucd>meta.code.multip</ucd><dataType xsi:type="vs:VOTableType" arraysize="2*">char</dataType></column><column><name>Name</name><description>Other name of the star</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="16*">char</dataType></column><column><name>RA1950</name><description>Right Ascension 1950</description><ucd>pos.eq.ra;meta.main</ucd></column><column><name>u_RA1950</name><description>':' when RA originally given to accuracy of 0.1min</description><ucd>meta.code.error;pos.eq.ra</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>DE1950</name><description>Declination 1950</description><ucd>pos.eq.dec;meta.main</ucd></column><column><name>u_DE1950</name><description>':' when DE originally given to accuracy of 0.1arcmin</description><ucd>meta.code.error;pos.eq.dec</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Vmag</name><description>Visual magnitude</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>B-V</name><description>? Colour index</description><unit>mag</unit><ucd>phot.color;em.opt.B;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Refs</name><description>[CEJMK, ] References (1)</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.ra</ucd><flag>nullable</flag><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.dec</ucd><flag>nullable</flag><flag>indexed</flag></column></table></schema></tableset></ri:Resource>