PCA approach to stellar effective temperatures J/A+A/553/A95 ivo://CDS.VizieR/J/A+A/553/A95 doi:10.26093/cds/vizier.35530095 CDS Munoz Bermejo J Asensio Ramos A. Allende Prieto C. 2018-01-04T08:22:19Z 2013-05-16T08:28:23Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr standard-stars spectroscopy effective-temperature The derivation of the effective temperature of a star is a critical first step in order to perform a detailed spectroscopic analysis. Spectroscopic methods suffer from systematic errors related to model simplifications. Photometric methods may be more robust, but are exposed to distortions caused by interstellar reddening. Direct methods are difficult to apply, since fundamental data of high accuracy are hard to obtain. We explore a new approach in which the spectrum is used to characterize a star's effective temperature based on a calibration established by a small set of standard stars. We perform Principal Component Analysis on homogeneous libraries of stellar spectra, then calibrate a relationship between the principal components and the effective temperature using a set of stars with reliable effective temperatures. We find that our procedure gives excellent consistency when spectra from a homogeneous set of observations are used. Systematic offsets may appear when combining observations from different sources. Using as reference the spectra of stars with high-quality spectroscopic temperatures in the Elodie library, we define a temperature scale for FG-type disk dwarfs with an internal consistency of about 50K, in excellent agreement with temperatures from direct determinations, but distinct from widely-used scales based in the infrared flux method. 2013A&A...553A..95M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/553/A95 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to http://atlas.obs-hp.fr/elodie/ : the ELODIE archive http://www.obs.u-bordeaux1.fr/m2a/soubiran/elodie_library.html : ELODIE: the stellar library Home Page III/251 : ELODIE library V3.1 (Prugniel+ 2007) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/553/A95 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/553/A95 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/553/A95 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/553/A95 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/553/A95 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/553/A95 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/553/A95/table5 (Effective temperatures for stars in the Elodie archive, derived by averaging multiple entries for each star) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/553/A95/table5? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/553/A95/table5? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/553/A95/table5? GET text/xml+votable 180.0 50000 true 231.9572147 29.1057006 0.005555555555555556 Cone search capability for table J/A+A/553/A95/table2 (Effective temperatures for stars in the Elodie library) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/553/A95/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/553/A95/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/553/A95/table2? GET text/xml+votable 180.0 50000 true 2.2117503 86.7878819 0.005555555555555556 5/2215 2569 2578 2582-2583 2586 2614 3514 3794 5555 5562 5582 6993 6997-6998 7611 7952-7953 6/7 16 49 60 65 71 75 100 120 140 166 172 200 215 218 222 236 248 262 273 295 309 311 313-314 322 325 327 333 336 338 340-342 346 348-350 373 377 382 398 402 405 408 411 417 421 428 455 463-464 472 474-475 478-479 481 483 493 496 498 500-501 508 524 540 567 587 601 618 634 684 686 701 706 712-713 719-720 725 737 742-743 748 754 758-759 763 765 770 778 798 815 819 824 833 861 871 890 892 900 917-918 934 937 940 944 946 964 968 980 987 1001 1005 1028 1030 1032 1042 1045 1053 1055 1063 1075 1084 1113 1115 1153 1167 1198 1200 1203 1220 1232 1237 1246-1247 1249 1260 1287 1293 1297 1299 1303 1317 1320 1330 1332 1340-1341 1355 1358 1362 1408 1412 1440 1449 1452 1458 1504 1530-1531 1535 1539 1550 1558 1573 1576 1578 1583 1587 1597 1601 1603 1608 1610-1611 1617 1623 1633 1642 1675 1711 1714 1728 1739 1759 1766 1782 1786 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31452 31471-31472 31478 31486 31497 31503 31532 31547 31549 31575 31582 31621 31630 31667 31686 31689-31690 31720 31739 31744-31745 31747-31749 31751-31753 31756-31757 31760 31763 31767-31768 31773-31774 31776 31779 31781-31783 31788-31790 31794-31796 31802 31805 31817 31820-31821 31825-31826 31828 31830 31832 31843 31846 31848 31874 31881 31920 31929-31930 31940 31944-31946 31966 31969 32000-32001 32010 32017 32019 32027 32033 32035 32045 32067 32073 32075 32083 32086 32096 32123 32126 32130 32170 32174 32192 32208 32211 32230 32288 32291 32299 32310 32318 32321 32328 32336 32343 32348 32352 32367 32372 32378 32413 32422 32429 32431 32448 32468 32509 32511 32516 32520 32537 32549 32554 32561 32575 32609-32610 32612 32617 32619 32633 32643 32645 32680 32694 32736 32751 32757 36290 36341 36379 36563 36664 36693 36697 36700 36714 36762 40355 40372 40431 40588 40644 40671 40679 40716 40823 40827 40885 40892 40921 40932 42977 44344 44347 44378 44385 44542 44651 44816 44844 44880 44891 44931 44993 45043 45050 48572 48587 48816 48852 48900 48939 48943 48980 49008 49049 49063 49078 49097 49103 49106 49114 49121 49129 49142 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/553/A95?format=ascii Optical default J/A+A/553/A95/table4 Effective temperatures for individual spectra in the Elodie archive recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID Star identifier meta.id;meta.main char OBSID Observation ID in the Elodie archive meta.id;obs char Teff Effective temperature from paper's PCA analysis K phys.temperature.effective int Sp Plot of the spectrum (from ELODIE archive) meta.ref.url char
J/A+A/553/A95/table5 Effective temperatures for stars in the Elodie archive, derived by averaging multiple entries for each star SimbadName Simbad column added by the CDS meta.id char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID Star identifier meta.id;meta.main char primary Teff Effective temperature from paper's PCA analysis K phys.temperature.effective int e_Teff Standard deviation among spectra of the same target K stat.error;phys.temperature.effective int Nspec Number of spectra available for this target meta.number int _RA Explain (right ascension part) deg pos.eq.ra;meta.main nullable _DE Explain (declination part) deg pos.eq.dec;meta.main nullable
J/A+A/553/A95/table2 Effective temperatures for stars in the Elodie library recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int FILE Filename from the Elodie archive meta.id;meta.file char ID Star identifier (typically its HD number) meta.id;meta.main char Teff Effective temperature in the Elodie catalog K meta.id int q_Teff [0/4] Quality flag for the Elodie Teff (4=best) (1) meta.code.qual;phys.temperature.effective int logg log10 of the surface gravity from Elodie log(cm.s**-2) phys.gravity float q_logg [0/1] Quality flag for the surface gravity from Elodie (2) meta.code.qual int [Fe/H] Iron abundance (log10 scale normalized to Sun) phys.abund.Fe float q_[Fe/H] [0/4] Quality flag for the Fe abundance from Elodie (4=best) (3) meta.code.qual;phys.abund.Fe int PCATeff Teff from this paper's PCA analysis K phys.temperature.effective int ELODIE Details from the ELODIE Library (Cat. III/251) meta.ref.url char Lsp Low-dispersion spectrum from ELODIE Library meta.ref.url char Simbad Simbad column added by the CDS meta.ref.url char _RA Explain (right ascension part) deg pos.eq.ra;meta.main nullable _DE Explain (declination part) deg pos.eq.dec;meta.main nullable