J/ApJS/257/65ivo://CDS.VizieR/J/ApJS/257/65doi:10.26093/cds/vizier.22570065CDSSun Y.Cheng Z.Ye S.Ding R.Peng Y.Zhang J.Huo Z.Cui W.,Wang X.Shi J.Lin J.Wu C.Li L.Feng S.Yu Y.Ma X.Li X.Liu C.,Zhang Z.Shao Z.2023-09-05T08:01:01Z2022-05-02T09:23:14ZCDS support team

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

cds-question@unistra.frcataclysmic-variable-starsnovaevariable-starsapparent-magnitudevisible-astronomyIn this work, we present a catalog of cataclysmic variables (CVs) identified from the sixth data release (DR6) of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). To single out the CV spectra, we introduce a novel machine-learning algorithm called UMAP to screen out a total of 169509 H{alpha} emission spectra, and obtain a classification accuracy of the algorithm of over 99.6% from the cross-validation set. We then apply the template-matching program PyHammer v2.0 to the LAMOST spectra to obtain the optimal spectral type with metallicity, which help us identify the chromospherically active stars and potential binary stars from the 169509 spectra. After visually inspecting all of the spectra, we identify 323 CV candidates from the LAMOST database, among them 52 objects are new. We further classify the new CV candidates in subtypes based on their spectral features, including five DN subtypes during outbursts, five NL subtypes, and four magnetic CVs (three AM Her type and one IP type). We also find two CVs that have been previously identified by photometry and confirm their previous classification with the LAMOST spectra.2021ApJS..257...65Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/257/65CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2004)V/94 : Catalog and Atlas of Cataclysmic Variables (Downes+ 1997)V/110 : Catalog of Cataclysmic Variables (Downes+ 2001)V/113 : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2003)V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)V/153 : LAMOST DR4 catalogs (Luo+, 2018)V/156 : LAMOST DR7 catalogs (Luo+, 2019)J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)J/AJ/146/34 : IR photometry of DA white dwarfs from LAMOST (Zhang+, 2013)J/MNRAS/443/3174 : 72 faint CV candidates in CRTS (Breedt+, 2014)J/MNRAS/456/4441 : Outburst cat. of cataclysmic variables (Coppejans+, 2016)J/other/RAA/18.68 : Cataclysmic variables from LAMOST DR3 (Han+, 2018)J/AJ/159/43 : Sp. identified CVs from LAMOST survey. I. (Hou+, 2020)J/AJ/159/198 : CVs in the ZTF 1st-yr (2018-2019) (Szkody+, 2020)J/AJ/160/151 : RVs of 5 cataclysmic variable cand. (Thorstensen, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/257/65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/257/65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/257/65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/257/65https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/257/65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/257/65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/257/65/cand (New confirmed CVs (Table 1), new possible CV candidates (Table 2) and previously known CV candidates (Table 3) from LAMOST DR6)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/257/65/cand?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/257/65/cand?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/257/65/cand?GETtext/xml+votable180.050000true5.98528542.78550.0055555555555555566/85 305 414 434 511 602 752 779 781 873 901 928 1137 1159 1179 1204 1206 1243 1253 1282 1297 1299 1332 1378 1387 1397 1413 1415 1419 1445 1470 1555 1558 1568 1596 1633 1685 1690 1694 1750 1770 1772 1781 1822 1840 2073 2079 2134 2153-2154 2188 2204 2209 2244 2248 2263 2280 2294 2297 2309 2401 2435 2440 2591 2607 2659 2674 2686 2715 2717 2754 2906 2942 3029 3097 3170 3198 3292 3410 3421 4123 4196 4273 4279 4296 4336 4348 4356 4367 4377 4479 4515 4603 4607 4723 4726 4740 4757 4790 4924 4964 4988 4999 5107 5115 5129 5191 5210 5345 5409 5485 5584 5591 5650 5809 5864 5883 5914 5918 6052 6172 6237 6258 6274 6315 6324 6376 6467 6491 6567 6599 6608 6643 6657 6668 6672 6694 6750 6829 6860 6883 6921 7036 7046 7109 7211 7248 7306 7873 8265 8281 8474 8503 8545 8552 8596 8804 8877 8977 9165 9267 9311 9333 9419 9441 9481 9484 9503 9527 9578 9669 9672 9723 9738 9829 10095 10434 10999 11072 11084 11112 11122 12556 12792 13245 13279 13309 13421 13682 13691 14018 14026 14441 14686 14964 15090 15110 15122 15133 15150 15368 17790 17818 17886 18095 18169 18207 18229 18844 18862 19009 19039 19085 19169 19173 19178 19180 19266 19316 19526 19592 19638 19950 20025 20066 20106 20128 20168 20318 20351 20436 21438 21822 22171 22253-22254 22280 22363 22464 22485 22745 22838 23275 23641 23653 23702 23719 23767 23772-23773 23841 23843 23850 23862 23880 23908 23946 23993-23994 24016 24025 24028 24046 24061 24106 24113 24139 24153 24164 24185 24198 24217 24275 24283 24320 24334-24335 24363 24374 24376 24390 24412 24466 24470 24481 24483-24484 24487 24489-24490 24510 24512 24574 25577 26157 26328 26588 27204 27343 27480 27482 27527 27612 27690 28082 28127 28221 28423 28501 30196 31357 31684 31997 32552https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/257/65?format=asciiOpticaldefaultJ/ApJS/257/65/candNew confirmed CVs (Table 1), new possible CV candidates (Table 2) and previously known CV candidates (Table 3) from LAMOST DR6recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_obsid[*n] Flag on object (1)meta.codecharobsid[312121/663709117] LAMOST Observation IDmeta.id;obslongSet"new" confirmed CVs (Table 1), "newp": new possible CV candidates (Table 2) or previously "known" CV candidates (Table 3)meta.codecharLAMOSTLAMOST position-based designationmeta.id;meta.maincharm_LAMOSTNumber of observation ID for this sourcemeta.numberintnullableMJD[55858/58252] Modified Julian Date of observation (JD-2400000.5)dtime.epochintRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainn_sType1[*] *=spectrum of a new CV candidatemeta.notecharsType1CV subtype, this work (2)meta.code.classcharsType2CV subtype, Hou+ (2020, J/AJ/159/43) (3)meta.code.classcharsType3CV subtype, SIMBAD (4)meta.code.classcharZTFmag[12.4/20.9]? Median ZTF magnitude (5)magphot.mag;em.optdoublenullabledZTFmag[0.03/6.1]? Magnitude difference (6)magphot.mag;arith.diffdoublenullableH20Display data from Hou+, 2020, J/AJ/159/43 if anymeta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar