J/ApJ/808/16ivo://CDS.VizieR/J/ApJ/808/16doi:10.26093/cds/vizier.18080016CDSNess M.Hogg D.W.Rix H.-W.Ho A.Y.Q.Zasowski G.2017-01-23T22:00:00Z2015-12-14T13:31:26ZCDS support team

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

cds-question@unistra.frmetallicityinfrared-astronomyspectroscopyNew spectroscopic surveys offer the promise of stellar parameters and abundances ("stellar labels") for hundreds of thousands of stars; this poses a formidable spectral modeling challenge. In many cases, there is a subset of reference objects for which the stellar labels are known with high(er) fidelity. We take advantage of this with The Cannon, a new data-driven approach for determining stellar labels from spectroscopic data. The Cannon learns from the "known" labels of reference stars how the continuum-normalized spectra depend on these labels by fitting a flexible model at each wavelength; then, The Cannon uses this model to derive labels for the remaining survey stars. We illustrate The Cannon by training the model on only 542 stars in 19 clusters as reference objects, with Teff, logg, and [Fe/H] as the labels, and then applying it to the spectra of 55000 stars from APOGEE DR10. The Cannon is very accurate. Its stellar labels compare well to the stars for which APOGEE pipeline (ASPCAP) labels are provided in DR10, with rms differences that are basically identical to the stated ASPCAP uncertainties. Beyond the reference labels, The Cannon makes no use of stellar models nor any line-list, but needs a set of reference objects that span label-space. The Cannon performs well at lower signal-to-noise, as it delivers comparably good labels even at one-ninth the APOGEE observing time. We discuss the limitations of The Cannon and its future potential, particularly, to bring different spectroscopic surveys onto a consistent scale of stellar labels.2015ApJ...808...16Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/808/16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/272 : RAVE 4th data release (Kordopatis+, 2013)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/794/125 : IN-SYNC. I. APOGEE stellar parameters (Cottaar+, 2014)J/AJ/148/54 : The Hypatia Catalog ((Hinkel+, 2014)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)J/AJ/146/133 : Stellar parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)J/AJ/142/193 : RAVE stellar elemental abundances (DR1) (Boeche+, 2011)J/A+A/531/A165 : MILES atmospheric parameters (Prugniel+, 2011)J/A+A/525/A71 : Atmospheric parameters for 1273 stars (Wu+, 2011)J/A+AS/141/371 : Low-mass stars evolutionary tracks&isochrones (Girardi+, 2000)J/ApJ/527/879 : Gravities for late-type stars (Allende Prieto+, 1999)J/A+AS/133/221 : Library of ELODIE spectra (F5-K7 stars) (Soubiran+ 1998)http://www.sdss3.org/ : SDSS-III home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/808/16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/808/16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/808/16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/808/16https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/808/16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/808/16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/808/16/table1 (Table of stellar labels)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/808/16/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/808/16/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/808/16/table1?GETtext/xml+votable180.050000true323.912166742.49741670.0055555555555555564/946 5/115 118 253 324 325 326 336 354 356 357 358 368 424 436 438 440 444 445 447 484 488 489 491 493 495 508 510 633 636 655 666 742 745 749 760 761 764 765 792 794 798 809 810 811 826 831 842 897 898 899 907 910 915 917 921 937 938 942 943 964 987 1018 1019 1063 1074 1195 1233 1271 1276 1277 1341 1384 1419 1489 1491 1537 1591 1600 1672 1673 1680 2300 2338 2339 2344 2357 2359 2416 2500 2502 2530 2536 2578 2580 2581 2584 2620 2668 3101 3235 3237 3238 3245 3247 3248 3439 3493 3501 3503 3504 3525 3543 3549 3566 3568 3583 3588 3589 3590 3596 3617 3644 3645 3646 3660 3661 3688 3695 3706 3730 3731 3736 3737 3740 3741 3742 3779 3780 3781 3782 3792 3845 3846 3847 3854 3875 3878 3908 3925 4772 5140 5368 5369 5371 5519 5539 5541 5542 5543 5545 5552 5553 5555 5556 5557 5563 5579 5593 5595 5601 5939 5942 5984 5985 5986 5988 6061 6067 6070 6071 6072 6084 6086 6106 6110 6114 6116 6117 6118 6128 6139 6334 6468 6528 6530 6563 6569 6676 6728 6729 6742 6743 6807 6813 6871 6908 6910 6917 6919 6943 6972 6973 6986 6993 7018 7072 7120 7121 7194 7213 7215 7272 7276 7279 7290 7301 7315 7337 7364 7365 7377 7378 7380 7381 7388 7389 7391 7466 7469 7480 7552 7555 7557 7559 7561 7564 7565 7567 7588 7590 7612 7692 7842 7843 7849 7854 7937 7939 8011 8033 10186 10187 12008 12010 6/455 466 484 485 496 497 991 1020 1021 1245 1247 1269 1308 1309 1342 1348 1349 1350 1385 1386 1387 1388 1390 1410 1411 1414 1420 1422 1436 1438 1440 1441 1444 1476 1478 1480 1481 1658 1659 1660 1662 1663 1674 1675 1695 1704 1717 1718 1719 1724 1725 1727 1738 1739 1748 1749 1750 1756 1759 1765 1766 1767 1768 1769 1772 1773 1775 1784 1785 1786 1849 1850 1851 1854 1925 1927 1930 1933 1935 1940 1942 1944 1945 1946 1951 1960 1962 1968 1970 1971 1976 1977 1979 2011 2012 2014 2016 2018 2024 2036 2038 2044 2522 2523 2540 2541 2552 2619 2704 2705 2707 2708 2709 2710 2752 2957 2958 2959 2972 2974 2987 2990 2991 2992 2993 2994 3002 3018 3019 3022 3023 3053 3064 3065 3068 3127 3133 3135 3174 3175 3180 3181 3183 3186 3187 3190 3196 3197 3199 3221 3235 3250 3256 3261 3263 3264 3269 3280 3281 3285 3287 3298 3299 3302 3308 3310 3323 3362 3363 3456 3457 3458 3496 3498 3514 3515 3518 3586 3587 3602 3605 3608 3622 3623 3634 3635 3638 3648 3649 3659 3665 3667 3672 3674 3681 3696 3746 3747 3756 3757 3758 3762 3766 3767 3810 3816 3817 3818 3840 3842 3845 3847 3853 3860 3862 3864 3865 3868 3942 3943 3945 3946 3947 4032 4033 4035 4036 4037 4038 4070 4071 4088 4090 4247 4277 4290 4320 4321 4590 4591 4779 4794 4929 4931 4937 4940 4941 4943 4944 4946 4952 5034 5035 5038 5081 5082 5083 5343 5372 5373 5514 5515 5544 5670 5671 5673 5675 5682 5683 5688 5689 5690 5764 5765 5955 5961 5963 5968 5970 5976 5985 5988 5989 6145 6147 6160 6162 6229 6231 6237 6361 6363 6378 6379 6382 6384 6385 6387 6388 6389 6390 6404 6406 6408 6409 6412 6536 6538 6666 6667 6670 6677 6679 6696 6697 6700 6724 6726 6728 6729 8954 8955 8958 8959 9178 9179 9189 9191 9197 9199 9204 9206 9208 9209 9210 9347 9380 9427 9433 9435 9457 9460 9535 9578 9579 9602 9608 9621 9623 9628 9629 9631 9672 9673 9674 9951 9973 9975 9991 9997 9999 10006 10021 10032 10033 10114 10115 10124 10126 10269 10271 10293 10307 10316 10318 10328 10329 10332 10340 10458 10459 10462 10469 10471 10477 10484 10486 10488 10489 10649 10650 10651 10652 10654 10655 10661 10663 10676 10677 10678 12382 12383 12401 12403 12412 12413 12554 12576 12578 12584 12861 12862 12863 12904 12906 12907 12934 12935 12946 12957 12958 12959 12964 12965 12976 12977 12979 12986 12987 13000 13002 13024 13026 13751 13794 13800 13802 13887 13930 13931 13980 13981 13983 14001 14003 14009 14011 14024 14048 14050 14056 14144 14167 14185 14186 14187 14188 14190 14193 14255 14259 14262 14268 14270 14276 14278 14280 14281 14331 14351 14364 14365 14373 14375 14381 14382 14383 14388 14390 14392 14393 14465 14467 14473 14476 14477 14480 14482 14488 14558 14559 14567 14573 14575 14588 14589 14619 14622 14623 14649 14652 14730 14731 14760 14767 14775 14777 14778 14779 14818 14819 14822 14828 14830 14831 14914 14915 14916 14918 14919 14937 14938 14939 14940 14942 14943 14952 14953 14956 14972 14973 14974 15109 15111 15114 15115 15132 15133 15134 15154 15160 15172 15173 15174 15176 15377 15378 15379 15405 15407 15410 15411 15414 15420 15422 15493 15495 15499 15504 15505 15506 15524 15525 15536 15621 15636 15697 15699 15705 15708 15709 16341 16343 16349 19002 19003 19077 19079 19085 19092 19094 19096 19097 19100 20549 20551 20557 20568 21480 21481 21483 22075 22120 22122 22139 22142 22143 22153 22154 22155 22162 22163 22176 22177 22179 22193 22196 22197 22216 22217 22219 22233 22236 22237 22242 22243 22246 22247 22248 22249 22251 22264 22266 22313 22314 22315 22330 22369 22370 22371 22377 22386 22392 22400 22401 22403 22416 23620 23621 23751 23762 23763 23765 23766 23767 23772 23773 23775 23781 23792 23793 23855 23866 23867 23949 23960 24222 24223 24253 24266 24267 24279 24292 24293 24295 24296 24304 24305 24306 24309 24327 24333 24335 24342 24348 24350 24383 24429 24430 24431 24434 24435 24438 24439 24444 24446 24450 24451 24453 24455 24461 24463 24476 24480 24481 24516 24518 24520 24528 24529 24553 24554 24555 25325 25327 25342 25429 25431 25437 25861 25863 25869 25876 25878 25880 25881 25883 25884 26116 26118 26124 26126 26264 26266 26267 26288 26289 26290 26606 26607 26693 26695 26708 26741 26890 26891 26894 26920 26921 26924 26962 26963 26966 26967 26993 26996 27227 27249 27251 27402 27424 27426 27478 27479 27481 27483 27505 27508 27509 27623 27629 27636 27638 27644 27645 27646 27665 27667 27673 27675 27714 27720 27767 27861 27867 27870 27896 27897 27900 27901 27903 27938 27969 27971 27977 27980 27981 27984 27986 27992 28032 28033 28064 28066 28067 28138 28139 28142 28168 28170 28192 28292 28294 28295 28296 28297 28299 28300 28301 28302 28489 28727 28732 28733 28735 28757 28770 28783 28794 28825 28827 28828 28830 28831 28849 28864 28869 28875 28878 28880 28888 28889 28890 28896 28897 28898 28900 28901 28904 28906 28909 28911 28912 28913 28914 28920 28922 28927 28928 28929 28932 29066 29067 29096 29097 29098 29108 29110 29112 29113 29155 29158 29164 29166 29178 29179 29181 29182 29183 29199 29202 29203 29208 29209 29210 29212 29213 29221 29223 29229 29232 29234 29240 29248 29249 29251 29252 29254 29255 29257 29259 29269 29298 29299 29304 29305 29318 29319 29324 29325 29440 29445 29447 29453 29464 29465 29469 29471 29506 29507 29516 29517 29528 29530 29531 29541 29561 29563 29855 29884 29885 29887 29928 29929 29930 30217 30219 30225 30227 30233 30234 30241 30242 30243 30248 30250 30264 30265 30272 30274 30280 30341 30343 30349 30356 30358 30364 30415 30426 30427 30430 30437 30439 30452 30454 30456 30457 30746 30747 30757 30759 30765 30772 30774 30776 30777 30780 31392 31393 31395 31404 31405 31407 31408 31410 31411 31745 31747 31753 31760 31762 31768 32041 32042 32043 32058 32128 32129 32131 32144 40737 40738 40739 40740 40742 40743 44986 44987 47871 48036 48038 48044 48046https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/808/16?format=asciiInfrareddefaultJ/ApJ/808/16/table1Table of stellar labelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAP? Apoge version (4412 or 4413)meta.softwareintnullableIDSteller identifier (1) \linkRole{2MASS data for this object or within 1" if not 2MASS name}meta.id;meta.maincharTeff[3140/5722] Effective temperatureKphys.temperature.effectivefloate_Teff[1/285] The 1{sigma} uncertainty in TeffKstat.error;phys.temperature.effectivefloatlog(g)[-1.4/5.2] Log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)[0.003/0.6] The 1{sigma} uncertainty in log(g)log(cm.s**-2)stat.errorfloat[Fe/H][-3/3.4] Metallicityphys.abund.Zfloate_[Fe/H][0.001/0.4] The 1{sigma} uncertainty in [Fe/H]stat.error;phys.abund.FefloatChi2[0.01/810] The {chi}^2^ valuestat.fit.chi2floatVscat[0/522068] Velocity scatterkm/sstat.error;phys.velocdoubleTFlagThe APOGEE_TARGET2 flag \pFile{_640x300}{J/ApJ/808/16/flags_t2.htx}{Binary flag}; see text for more explanationsmeta.codeAFlagThe APOGEE_ASPCAPFLAG flag (2) \pFile{_640x300}{J/ApJ/808/16/flags.htx}{Binary flag}; see text for more explanationsmeta.codeCFlag[CS] Commissioning flag (3)meta.codecharDref[0.002/1] Distance between test star and nearest reference object (4)pos.distancefloatEFlag[0/1] Extrapolation flag (5)meta.codeintM13Sources within 0.5" from Meszaros, 2013, J/AJ/146/133meta.ref.urlintnullable_RAPositions from IDs (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from IDs (declination part)degpos.eq.dec;meta.mainindexed