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<ri:Resource created="2006-01-06T22:19:04Z" 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>Perkins Revised MK Types for the Cooler Stars</title><shortName>III/150A</shortName><identifier>ivo://CDS.VizieR/III/150A</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Keenan P.C.</name></creator><creator><name>McNeil R.C.</name></creator><date role="Updated">2017-11-06T12:23:58Z</date><date role="Created">2006-01-06T22:19:04Z</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>late-type-stars</subject><subject>standard-stars</subject><description>The original catalog of standard stars classified on the Revised MK system published in 1989 contains 1054 standard stars of spectral types G0 and later (G, K, M, and a few S stars) classified at the Perkins Observatory. The present version of the catalog takes into account the revisions (before 14h of RA) presented by Philip C. Keenan and Gerald H. Newsom at the Department of Astronomy of the Ohio State University (http://www-astronomy.mps.ohio-state.edu/MKCool) dated 2000 January; the Sun (G2V star) has been omitted from the catalog. Accurate positions were added in 2003. The revised MK system is described by Keenan (1987PASP...99..713K). The spectrograms used for the classification were taken at four different observatories; hence, extensive comparisons have been made to ensure consistency between the Northern and Southern Hemispheres. The list provides a consistent set of standards in most parts of the sky and over a considerable range in magnitude, for stars later than G0. The catalog is not a survey complete to any magnitude and is not intended for statistical studies.</description><source format="bibcode">1989ApJS...71..245K</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/III/150A</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><relationship><relationshipType>related-to</relationshipType><relatedResource>http://www.astronomy.ohio-state.edu/MKCool/ : The Revised Catalog of</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/III/18">III/18 : Stellar Spectra Classified in Morgan-Keenan System (Jaschek+ 1964)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/III/42">III/42 : Selected MK Spectral Types (Jaschek, 1978)</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/150A</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=III/150A</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=III/150A</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL use="base">https://vizier.cds.unistra.fr/viz-bin/votable?-source=III/150A</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/votable?-source=III/150A</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South 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V magnitude</description><unit>mag</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>u_Vmag</name><description>[:v] uncertainty of variability flag</description><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Vmag2</name><description>? Second V magnitude for other star type (2)</description><unit>mag</unit><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>u_Vmag2</name><description>[p:] additional note for Vmag (3)</description><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Note</name><description>[*+] indicates a note detailed in "notes.dat" (4)</description><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Simbad</name><description>Simbad column added by the CDS</description><dataType xsi:type="vs:VOTableType" arraysize="*">char</dataType></column></table><table><name>III/150A/notes</name><description>Notes to the catalog</description><column><name>Note</name><description>Text of note</description><dataType xsi:type="vs:VOTableType" arraysize="44*">char</dataType></column><column><name>recno</name><description>Record number assigned by the VizieR team. 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