J/A+A/583/A115ivo://CDS.VizieR/J/A+A/583/A115doi:10.26093/cds/vizier.35830115CDSBagnulo S.Fossati L.Landstreet J.D.Izzo C.2019-02-27T14:39:24Z2015-11-04T09:20:32ZCDS support team

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

cds-question@unistra.frmagnetic-fieldspolarimetryspectroscopyThe FORS1 instrument of the ESO Very Large Telescope was used to obtain low resolution circular polarized spectra of nearly a thousand of different stars, with the aim of measuring their mean longitudinal magnetic fields. Magnetic fields were measured by different authors, and using different methods and software tools. A catalogue of FORS1 magnetic measurements would provide a valuable resource with which to better understand the strengths and limitations of this instrument and of similar low-dispersion, Cassegrain spectropolarimeters. However, FORS1 data reduction has been carried out by a number of different groups using a variety of reduction and analysis techniques. Both our understanding of the instrument and our data reduction techniques have improved over time. A full re-analysis of FORS1 archive data using a consistent and fully documented algorithm would optimise the accuracy and usefulness of a catalogue of field measurements. Based on ESO FORS pipeline, we have developed a semi-automatic procedure for magnetic field determinations, which includes self-consistent checks for field detection reliability. We have applied our procedure to the full content of circular spectropolarimetric measurements of the FORS1 archive. We have produced a catalogue of spectro-polarimetric observations and magnetic field measurements for 1400 observations of 850 different objects. The spectral type of each object has been accurately classified. We have also been able to test different methods for data reduction is a systematic way. The resulting catalogue has been used to produce an estimator for an upper limit to the uncertainty in a field strength measurement of an early type star as a function of the signal-to-noise ratio of the observation. While FORS1 is not necessarily an optimal instrument for the discovery of weak magnetic fields, it is very useful for the systematic study of larger fields, such as those found in Ap/Bp stars and in white dwarfs.2015A&A...583A.115Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/583/A115CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/134 : Catalog of Magnetic Field Measurements (Didelon 1983)J/A+A/407/631 : Stellar effective magnetic fields catalogue (Bychkov+, 2003)J/A+A/430/1143 : Stellar magnetic rotational phase curves (Bychkov+, 2005)J/MNRAS/394/1338 : Stellar effective magnetic fields. II. (Bychkov+, 2009)J/PASP/126/469 : PolarBase catalogue of stellar spectra (Petit+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/583/A115https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/583/A115http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/583/A115https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/583/A115https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/583/A115http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/583/A115GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/583/A115/catalog (Magnetic field measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/583/A115/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/583/A115/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/583/A115/catalog?GETtext/xml+votable180.050000true0.544167-43.1655560.0055555555555555565/5359 6/319 455 463 481 579 582 1032 1113-1114 1545 1591 4104 4346 4504 4610 4938 8389 10255 12396 12539 12546 12766 12811 12943 13480 14381 14632 16430 16491 16602 16685 16867 16982 17012 17039 17064 17364 17421 17468 17625 17670 17754 17879 17922 18346 18372 18415 18709 18712 19017 19042 19141 19271 19384 19741 19757 19898 19987 20066 20322 20497 20517 20761 20782 20797 20834 20862 20915 21099 21127 21196 21220 21264 21366 21418 21421 21433 21447 21529 21643 21645-21647 21682 21718 21939 22014 22056 22211 22249 22334 22394 22400 22503 22615 22638 22772 22784 22805 22807 22828 22839 22850-22851 22854-22855 22861-22862 22870 22873 22883 22895 22904 22911 23101 23122 23200 23244 23255 23349 23358 23410 23451 23488 23636-23637 23641 23644 23717 23719 23736 23769 23798 23860 23947 24179 24279 24281 24674 24795 24813 24912 25008 25056 25220 25516 25552 25568 25792 25939 26092 26756 26808 26916 26962 27699 27731 27878 27966 28137 28687-28688 28703 28711 28717 28762 28780 28800 28806-28807 28809 28812 28830 28890 28900 28921 28973 29014 29040 29081 29084 29089 29095 29131 29164 29176 29207-29208 29221 29454 29459 29486 29510 29535 29555 29711 29729 30083 30093 30188 30251 30302 30304 30315 30325 30363 30406 30586 30694 30722 30776 30818 30939 31063 31259 31292 31511 31544 31710 31716 31774 31812 32043 32065 32070 32087 32096 32576 32816 32819 32847 32983 33008 33015 33074 33108 33188 33197 33235 33301 33305 33487 33795 34054 34181 34240 34522 34526 34875 34926 35121 35151 35490 35532 35614 35663 35702 35705 35772 35798 35909 35943 36048 36121 36130 36154 36220 36278 36290 36363 36502 36605 36651 36937 36956-36957 37099 37131 37164 37169 37174 37186 37230-37231 37268 37323 37330 37333 37349 37351 37353 37357 37362 37364 37367 37370 37544 37592-37593 37602 37662 37721 37745 37787 37790 37812 37851 37856 37886 37901 37916 37927 37932-37934 37936 37944 37978 37997 38002 38018 38028 38054 38067 38073 38078 38143 38174 38211 38287 38306 38409 38441 38449 38625 38682 38749 38941 38980 38996 39020 39143 39163 39192 39217 39228 39251 39255 39290 39328 39352 39354-39355 39371-39372 39374 39720 39735 39770 39820 39826 39832 39853 39863 39869 39888 39905 39922 40023 40068 40070 40356 40617 40806 40944 41017 41088 41144 41154 41168 41210 41287 41320 41439 41447 41461 41472 41497 41524 41552 41557 41562 41565 41568 41570 41666 41697 41731-41732 41734 41747 41750 41863 41875 41911 41983 42024 42029 42035 42040 42071 42074 42191 42212-42214 42227 42234 42243 42270 42273 42312 42325 42356-42357 42366 42394 42396 42416 42429 42463-42464 42479 42483 42611 42633 42640 42644 42673 42691 42728 42757 42760 42829 42931 42934 42972 42988 43004 43017 43033 43035 43062 43140 43201 43270 43279 43301 43310 43332 43365 43407 43531 43677 43798 43809 43843 44043 44049 44066 44074 44179 44258 44362 44393 44438 44464 44468 44616 44707 44892 45081 45097 45110 45132 45165 45203 45246 45430 45455 45573 45589 45746 45921 45962 46008 46069 46081 46084 46096 46118 46131 46281 46436 46459 46470 46598 46612 46637 46856 47090 47100 47205 47304 47342 47349 47376 47539 47574 47626 47672 47828 47845 47855 47957 47977 47985 48072 48146 48203 48218 48459 48562 48728 48755 48769 48781 48896 48911 48993https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/583/A115?format=asciidefaultJ/A+A/583/A115/catalogMagnetic field measurementsSimbadNameSimbad column added by the CDSmeta.idcharNNumber of exposuresmeta.idintgrismGrism namemeta.id;instrcharPIDProgramme IDmeta.idcharMJDModified Julian Date at mid observing seriesdtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension from the FORS1 fits-headers (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination from the FORS1 fits-headers (J2000) (1)pos.eq.dec;meta.mainNameStar identifiermeta.id;meta.maincharClassClassificationsrc.classcharObsDate of the observation (mid exposure)stime.epochnullableTexpExposure timestime.duration;obs.exposureintwidthSlit widtharcsecspect.line.widthfloatRSpectral resolutionspect.resolutionintblambdaLower limit of the observed spectral range0.1nminstr.bandwidth;stat.minintBlambdaUpper limit of the observed spectral range0.1nminstr.bandwidth;stat.maxintSNRSignal-to-noise ratio per Angstromstat.snrintlsnrCentral wavelength of the 100{AA} interval range in which the S/N ratio reaches the maximum0.1nmem.wl.central;stat.maxint<Bz>(H)Longitudinal field measured from H Balmer linesGphys.magFieldinte_<Bz>(H)Error bar of <Bz>(H)Gstat.errorintchi<Bz>(H)Reduced minimum chi-square from the fit to measure <Bz>(H)stat.fit.chi2float<Nz>(H)Null field measured from H Balmer linesGphys.magFieldinte_<Nz>(H)Error bar of the Null field measured from <Nz>(H)Gstat.errorintchi<Nz>(H)Reduced minimum chi-square from the fit to measure the <Nz>(H)stat.fit.chi2float<Bz>(m)Longitudinal field measured from metal linesGphys.magFieldinte_<Bz>(m)Error bar of <Bz>(m)Gstat.errorintchi<Bz>(m)Reduced minimum chi-square from the fit to measure <Bz>(m)stat.fit.chi2float<Nz>(m)Null field measured from metal linesGphys.magFieldinte_<Nz>(m)Error bar of the Null field measured from <Nz>(m)Gstat.errorintchi<Nz>(m)Reduced minimum chi-square from the fit to measure the <Nz>(m)stat.fit.chi2float<Bz>(T)Longitudinal field measured from H Balmer and metal linesGphys.magFieldinte_<Bz>(T)Error bar of <Bz>(T)Gstat.errorintchi<Bz>(T)Reduced minimum chi-square from the fit to measure <Bz>(T)stat.fit.chi2float<Nz>(T)Null field measured from H Balmer and metal linesGphys.magFieldinte_<Nz>(T)Error bar of the Null field measured from <Nz>(T)Gstat.errorintchi<Nz>(T)Reduced minimum chi-square from the fit to measure the <Nz>(T)stat.fit.chi2floatFileNameName of the tarball file with the intensity spectra in subdirectory sp (2)meta.id;spect.line.intensity;meta.filechar