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<ri:Resource created="2020-06-12T09:43:16Z" 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>Cataclysmic variables in the ZTF 1st-yr (2018-2019)</title><shortName>J/AJ/159/198</shortName><identifier>ivo://CDS.VizieR/J/AJ/159/198</identifier><altIdentifier>doi:10.26093/cds/vizier.51590198</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Szkody P.</name></creator><creator><name>Dicenzo B.</name></creator><creator><name>Ho A.Y.Q.</name></creator><creator><name>Hillenbrand L.A.</name></creator><creator><name>van Roestel J.,Ridder M.</name></creator><creator><name>DeJesus Lima I.</name></creator><creator><name>Graham M.L.</name></creator><creator><name>Bellm E.C.</name></creator><creator><name>Burdge K.</name></creator><creator><name>Kupfer T.,Prince T.A.</name></creator><creator><name>Masci F.J.</name></creator><creator><name>Mroz P.J.</name></creator><creator><name>Golkhou V.Z.</name></creator><creator><name>Coughlin M.,Cunningham V.A.</name></creator><creator><name>Dekany R.</name></creator><creator><name>Graham M.J.</name></creator><creator><name>Hale D.</name></creator><creator><name>Kaplan D.</name></creator><creator><name>Kasliwal M.M.,Miller A.A.</name></creator><creator><name>Neill J.D.</name></creator><creator><name>Patterson M.T.</name></creator><creator><name>Riddle R.</name></creator><creator><name>Smith R.</name></creator><creator><name>Soumagnac M.T.</name></creator><date role="Updated">2023-09-05T06:50:13Z</date><date role="Created">2020-06-12T09:43:16Z</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>variable-stars</subject><subject>cataclysmic-variable-stars</subject><subject>visible-astronomy</subject><subject>spectroscopy</subject><subject>trigonometric-parallax</subject><subject>photometry</subject><subject>surveys</subject><description>Using selection criteria based on amplitude, time, and color, we have identified 329 objects as known or candidate cataclysmic variables (CVs) during the first year of testing and operation of the Zwicky Transient Facility. Of these, 90 are previously confirmed CVs, 218 are strong candidates based on the shape and color of their light curves obtained during 3-562days of observation, and the remaining 21 are possible CVs but with too few data points to be listed as good candidates. Almost half of the strong candidates are within 10{deg} of the galactic plane, in contrast to most other large surveys that have avoided crowded fields. The available Gaia parallaxes are consistent with sampling the low mass transfer CVs, as predicted by population models. Our follow-up spectra have confirmed Balmer/helium emission lines in 27 objects, with four showing high-excitation HeII emission, including candidates for an AM CVn, a polar, and an intermediate polar. Our results demonstrate that a complete survey of the Galactic plane is needed to accomplish an accurate determination of the number of CVs existing in the Milky Way.</description><source format="bibcode">2020AJ....159..198S</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/198</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 ivo-id="ivo://CDS.VizieR/B/cb">B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2004)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/B/vsx">B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/V/123">V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/V/133">V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/II/335">II/335 : Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/345">I/345 : Gaia DR2 (Gaia Collaboration, 2018)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/117/319">J/ApJS/117/319 : Northern RASS X-ray sources catalog (Appenzeller+ 1998)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/565/511">J/ApJ/565/511 : Cataclysmic variables in the 2MASS 2IDR (Hoard+, 2002)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/696/870">J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/142/181">J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/144/81">J/AJ/144/81 : Spectro. &amp; photometry of CV candidates (Thorstensen+, 2012)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/PASJ/64/63">J/PASJ/64/63 : Dwarf novae characterization using SDSS (Kato+, 2012)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/426/1235">J/MNRAS/426/1235 : UVEX sources spectroscopic follow-up (Verbeek+, 2012)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/443/3174">J/MNRAS/443/3174 : 72 faint CV candidates in CRTS (Breedt+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/441/1186">J/MNRAS/441/1186 : Cataclysmic variables from CRTS (Drake+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/788/48">J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/443/3174">J/MNRAS/443/3174 : 72 faint CV candidates in CRTS (Breedt+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AcA/65/313">J/AcA/65/313 : 1000 new dwarf novae from the OGLE Survey (Mroz+, 2015)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/456/4441">J/MNRAS/456/4441 : Outburst cat. of cataclysmic variables (Coppejans+, 2016)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/153/144">J/AJ/153/144 : Spectroscopy of mCVs &amp; variable objects (Oliveira+, 2017)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/465/4968">J/MNRAS/465/4968 : Cataclysmic variables observations (Hardy+, 2017)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/other/RAA/18.68">J/other/RAA/18.68 : Cataclysmic variables from LAMOST DR3 (Han+, 2018)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/159/114">J/AJ/159/114 : Magnetic CVs spectra &amp; variable objects II (Oliveira+,2020)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/159/43">J/AJ/159/43 : Spectro. identified CVs from LAMOST survey. 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Gaia DR2 (I/345) parallax</description><unit>mas</unit><ucd>pos.parallax.trig</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>e_plx</name><description>[0.02/0.6]? Uncertainty in parallax</description><unit>mas</unit><ucd>stat.error;pos.parallax</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Nout</name><description>Number of normal outbursts (SOB = superoutburst) (1)</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>Days</name><description>[3/562] Interval of actual coverage by ZTF in days up to 2019 May 8</description><unit>d</unit><ucd>time.interval</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>SDSS</name><description>[Y ]? Source is in the Sloan Digital Sky Survey (SDSS) footprint</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="2*">char</dataType></column><column><name>CRTS</name><description>? Outbursts observed by the Catalina Real-time Transient Survey (CRTS)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="3*">char</dataType></column><column><name>Simbad</name><description>Simbad column added by the CDS</description><ucd>meta.ref.url</ucd><dataType xsi:type="vs:VOTableType" arraysize="*">char</dataType></column><column><name>Spec</name><description>? Available spectra (2)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>Other</name><description>Identifier and other surveys (3)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="27*">char</dataType></column><column><name>Gaia</name><description>Display data from Gaia DR2 (I/345) within 0.5"</description><ucd>meta.ref.url</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column></table></schema></tableset></ri:Resource>