J/A+A/623/A127ivo://CDS.VizieR/J/A+A/623/A127doi:10.26093/cds/vizier.36230127CDSAhmed S.Warren S.J.2019-03-26T11:36:44Z2019-03-18T08:27:37ZCDS support team

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

cds-question@unistra.frsurveysm-starsvisible-astronomysloan-photometryinfrared-photometryThe space density of late M dwarfs, sub-types M7 to M9.5, is not well determined. We have applied the photo-type method of Skrzypek et al. to iz photometry from SDSS and YJHK photometry from UKIDSS, over an effective area of 3070deg^2^, to produce a new, bright J(Vega)<17.5, homogeneous sample of 33665 M7 to M9.5 dwarfs. The typical S/N of each source summed over the 6 bands is >100. Classifications are provided to the nearest half spectral sub-type. Through comparison with the classifications in the BUD spectroscopic sample of Schmidt et al. (2010, Cat. J/AJ/139/1808), the typing is shown to be accurately calibrated to the BUD classifications, with a precision better than 0.5 sub-types rms, i.e. is as precise as good spectroscopic classification. Sources with large chisq>20 include several catalogued late-type subdwarfs. The new sample of late M dwarfs is highly complete, but there is a bias in the classification of rare peculiar blue or red objects. For example L subdwarfs are misclassified towards earlier types by approximately two spectral sub-types. We estimate that this bias affects only ~1% of sources. Therefore the sample is well suited for measuring the luminosity function, as well as investigating the softening towards the Galactic plane of the exponential variation of density with height.2019A&A...623A.127Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/623/A127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/623/A127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/623/A127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/623/A127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/623/A127https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/623/A127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/623/A127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/623/A127/table1 (List of M7-M9.5 dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/623/A127/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/623/A127/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/623/A127/table1?GETtext/xml+votable180.050000true0.000291715.20358330.0055555555555555563/64 128 130 162 284 286 295 304 306 409 411-413 423 427-430 432-434 4/260-262 264 299 301-303 310 312 385 388 516-518 544 578 582 584 641-644 646-647 652 1111 1115-1118 1127 1131-1132 1134-1135 1140 1142-1143 1148-1149 1175 1179 1191 1200-1202 1204-1205 1223 1228-1229 1232-1234 1248-1249 1365 1367 1373 1621-1623 1625-1629 1631 1641-1643 1657-1660 1685-1687 1690 1701-1703 1705 1707 1724 1740 1742 1744-1746 1757 1760-1761 1961-1964 1966-1967 5/0 2 5-8 10-12 16 32-34 130 136 138 1052 1054 1060-1062 1064 1072 1088-1090 1092 1189-1191 1201-1203 1227 1230-1231 1239 1244-1246 1252 1256 1265 1410 1416 1548-1549 1556 1560 2076 2096 2098 2143 2165 2167 2173-2174 2180 2184-2186 2223 2234 2260 2262 2265 2288-2290 2316 2318-2319 2332 2340-2342 2352 2563 2582 2612 2616-2617 2634 2688-2689 2691-2694 3072 4437-4439 4441-4443 4453-4455 4457-4459 4476 4478 4501-4503 4505-4507 4517-4519 4521-4523 4532-4534 4564 4566-4567 4600-4602 4604 4693-4695 4697-4699 4709-4711 4713-4715 4751 4757-4759 4761-4763 4773-4775 4777-4778 4780 4812-4813 4824-4825 4828-4829 4880-4882 4886-4888 4890-4891 4920-4922 4924 4944 5000-5001 5008 5459 5465 5467 5501 5786 5797-5799 5801-5802 5804 5818 6397 6399 6461-6463 6477 6479 6483 6497 6499 6520 6522-6523 6541-6543 6561-6563 6624 6626-6627 6644-6646 6648-6650 6717-6719 6735 6737-6739 6753 6755 6757-6759 6764 6766-6767 6797 6799 6801-6803 6817-6819 6825-6827 6900-6901 6904 6964-6966 6972 7007 7027 7036-7037 7039 7048-7050 7052 7056 7509-7510 7823 7834 7841-7843 7862 7912 7914 10237 11261 11263 12287 6/17 19 37-39 52 56-58 68 72 160 524 526-527 538 548-550 556-558 640-642 644 648 4212-4214 4220 4252-4254 4260-4262 4264 4292 4364-4366 4372 4374 4377 4385 4731 4734-4735 4749 4751 4753-4755 4775 4781 4800 4802-4803 4903-4904 4906-4907 4914-4915 4918-4919 4939 4942-4943 4951 4955 4988-4990 5012-5014 5016-5018 5028 5030 5032 5034 5056-5057 5072 5633-5635 5645-5647 5650 5656 5672 6157 6159 6181 6228-6230 6232-6234 6244 6246 6249 8308 8312 8314-8315 8388-8390 8396-8398 8416-8418 8448-8450 8565 8567 8665 8667 8689 8691 8700-8702 8724 8728 8730-8731 8748 8832 8840 8885-8887 8889-8891 8930 8940 8942 9031 9037 9039 9044 9046 9052 9054 9065 9067-9070 9072 9074 9117 9119 9164 9168 9226-9227 9230 9269-9271 9295 9306-9307 9336-9338 9372-9374 9376-9377 9380-9382 9392 9412-9414 9416 10245-10247 10249-10251 10322 10332 10334 10452-10454 10456-10458 10460 10472-10474 10476 10480 10530 10624 10760-10761 10763 10788-10789 10800 10816 12292 12296 17405-17407 17661-17663 17726-17727 17741-17743 17745-17747 17761-17763 17799 17805-17807 17809-17811 17825-17827 17908-17910 17981 17983 17997-17999 18001-18003 18017-18019 18061-18063 18065 18067 18081-18083 18140 18142-18143 18262 18412-18414 18685-18687 18749-18751 18765-18767 18769-18771 18785-18787 18829-18831 18833-18835 18849-18851 19021-19023 19025-19027 19041-19043 19085-19087 19089-19091 19105-19107 19116-19118 19136-19138 19140-19141 19152 19256-19257 19259-19262 19304-19305 19307-19309 19320 19532-19534 19536-19537 19539-19541 19543 19556 19558-19559 19692-19694 19700 19760-19762 19764 19768 19780 19784 19840-19842 19844 19848 20016-20017 20020 20036 20040 21813 21815 21829-21831 21833-21835 21856 21859 21864-21865 21867 21956-21957 21959 21965 22001 22003 22012-22013 23101-23103 23137-23140 23142-23143 23148-23150 23154 23160 23181-23183 23185-23187 23201-23203 23212-23214 23220 23224 23230-23234 23240 23245-23247 23265-23270 23276-23278 25559 25565 25567 25581-25583 25585-25587 25592 25594-25595 25823 25837-25839 25841-25843 25913-25915 25925-25927 25929-25931 25993-25995 26084 26086-26087 26135 26141-26143 26157-26159 26161-26163 26241-26243 26501-26503 26588-26590 26604-26606 26608-26610 26863 26867 26903 26909 26911 26935 26937 26945-26947 27019 27025-27027 27061-27063 27165-27167 27193-27195 27202-27203 27267 27296 27298-27299 27608-27610 27612-27613 27620-27622 27624-27626 27632 27868-27870 27892 27896 27952-27954 27956 27968-27970 27976 28021-28023 28025-28027 28032-28034 28101-28103 28105 28107 28132-28133 28135 28152-28153 28155 28204-28205 28216 28228 28232 28288-28290 28500-28501 28503 30029 30031 30033-30035 30044-30046 30053 30064-30066 31286-31287 31290-31291 31342 31363 31442 31452 31454-31455 31654 36861-36863 40927 40947 40953-40957 40959 45023 45039 45043 45049-450518.305533028865447e-20 2.821731604724377e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/623/A127?format=asciiOpticalInfrareddefaultJ/A+A/623/A127/table1List of M7-M9.5 dwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintULASSource ULAS name, JHHMMSS.ss+DDMMSS.s, UKIDSS-DR9, Lawrence et al., 2012, Cat. II/319meta.id;meta.maincharAngsepAngular separation UKIDSS/SDSSarcsecpos.angDistancefloatimagSDSS i (in Vega)magphot.mag;em.opt.Ifloate_imagSDSS i error (in Vega)magstat.error;phot.mag;em.opt.IfloatzmagSDSS z (in Vega)magphot.mag;em.opt.Ifloate_zmagSDSS z error (in Vega)magstat.error;phot.mag;em.opt.IfloatYmagUKIDSS Y (in Vega)magphot.mag;em.IR.Jfloate_YmagUKIDSS Y error (in Vega)magstat.error;phot.mag;em.opt.BfloatJmagUKIDSS J (in Vega)magphot.mag;em.IR.Jfloate_JmagUKIDSS J error (in Vega)magstat.error;phot.mag;em.IR.JfloatHmagUKIDSS H (in Vega)magphot.mag;em.IR.Hfloate_HmagUKIDSS H error (in Vega)magstat.error;phot.mag;em.IR.HfloatKmagUKIDSS K (in Vega)magphot.mag;em.IR.Kfloate_KmagUKIDSS K error (in Vega)magstat.error;phot.mag;em.IR.KfloatPhTypePhoto-type classificationsrc.spTypecharchi2Chi2 value from photo-type classificationstat.fit.chi2floatE8Reddeningphot.color.excessfloatSpType? Spectral type given in literature (1)src.spTypecharDistEstimated distancepcpos.distancefloatGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloat_RAPositions from ULAS name (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from ULAS name (declination part)degpos.eq.dec;meta.mainindexed