Magnetic field measurements of Ap/Bp stars

Magnetic field measurements of Ap/Bp starsJ/ApJ/873/L5ivo://CDS.VizieR/J/ApJ/873/L5doi:10.26093/cds/vizier.18739005CDSChojnowski S.D.Hubrig S.Hasselquist S.Castelli F.Whelan D.G.,Majewski S.R.Nitschelm C.Garcia-Hernandez D.A.Stassun K.G.Zamora O.2020-11-30T07:41:18Z2020-09-09T12:35:04ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starsmagnetic-fieldsstellar-spectral-typesatomic-physicsinfrared-astronomyspectroscopyvisible-astronomyWe report on magnetic field measurements of 157 chemically peculiar A/B stars (Ap/Bp) based on resolved, magnetically split absorption lines present in H-band spectra provided by the Sloan Digital Sky Survey (SDSS)/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. These stars represent the extreme magnetic end of a still-growing sample of >900 Ap/Bp stars selected among the APOGEE telluric standard stars as those with CeIII absorption lines and/or literature Ap/Bp classifications. The lines most frequently resolved into their split components for these stars in the H-band pertain primarily pertain to CeIII, CrII, FeI, MnII, SiI, and CaII, in addition to one or more unidentified ions. Using mean magnetic field modulus () estimates for transitions with known Lande factors, we estimate effective Lande factors for 5 CeIII lines and 15 unknown lines and proceed to measure of 157 stars, only 3 of which have previous literature estimates of . This 183% increase in the number of Ap/Bp stars for which has been measured is a result of the large number of stars observed by SDSS/APOGEE, extension of high-resolution Ap/Bp star observations to fainter magnitudes, and the advantages of long wavelengths for resolving magnetically split lines. With ~25kG, the star 2MASS J02563098+4534239 is currently the most magnetic star of the SDSS/APOGEE sample. Effective Lande factors, representative line profiles, and magnetic field moduli are presented. The validity of the results is supported using optical, high-resolution, follow-up spectra for 29 of the stars.2019ApJ...873L...5Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/873/L5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009- )III/218 : ELODIE archive (Prugniel+, 2001)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)I/322 : UCAC4 Catalogue (Zacharias+, 2012)J/AJ/149/7 : SDSS-III/APOGEE. I. Be stars (Chojnowski+, 2015)J/ApJS/221/24 : SDSS-III APOGEE H-band spectral line lists (Shetrone+, 2015)J/A+A/601/A14 : Radial velocities of magnetic Ap stars (Mathys, 2017)J/MNRAS/480/2953 : Catalogue of CP stars (HgMn, ApBp, AmFm) (Ghazaryan+, 2018)http://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/873/L5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/873/L5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/873/L5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/873/L5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/873/L5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/873/L5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/873/L5/table2 (Magnetic field modulus estimates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/873/L5/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/873/L5/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/873/L5/table2?GETtext/xml+votable180.050000true0.908777270.30602920.0055555555555555566/462 1115 1169 1216 1292 1313 1358 1534 1602 1659 1710 1747 1768 1922 1954 2034 2354 2411 2518 2872 2941 2971 2975 3015 3075 3081 3221 3276 3308 3316 3326 3337 3398 3424 3656 3715 3766 3771 3822 4074 4763 6396 6461 6577 6646 6688 6689 6932 6995 7022 7077 7919 11786 12940 12942 13016 13800 13805 13973 13981 13992 14013 14044 14139 14175 14269 14287 14328 14573 14826 14928 14950 15135 15141 15379 15385 15387 15441 15445 15480 15648 15666 15701 15766 17753 20807 20903 21742 22071 22155 22173 22227 22499 22508 22510 22867 23584 23662 23739 23776 23811 23976 23982 24036 24088 24115 24324 24450 24492 24496 24515 24544 24558 27819 27889 28728 28733 28781 28802 28838 28876 28969 29260 29558 29735 29829 29888 29920 30292 30341 30375 30381 30465 30544 30645 30678 30700 30707 31579 31751 31756 32025 32144 33024 33299 37609 37612 39005 39188 39849 40697 41337 42019 42583 42619 42690 430141.1166583743361574e-19 1.2918781580533825e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/873/L5?format=asciiOpticalInfrareddefaultJ/ApJ/873/L5/table2Magnetic field modulus estimatese_BH[0.15/1.4] Uncertainty in BHdTstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifiermeta.id;meta.maincharONameOther identifiermeta.idcharVmag[6.3/12.4] UCAC4 catalog V band magnitudemagphot.mag;em.opt.VfloatHmag[6.2/11] 2MASS H band magnitudemagphot.mag;em.IR.HfloatNsp[1/25] Number of APOGEE spectrameta.numberintS/N[54/1885] Signal-to-Noise ratio of combined spectrumstat.snrintSpTEstimated or literature spectral typesrc.spTypecharr_SpTReference code for SpType (1)meta.ref;pos.framecharBH[3.58/24.61] Magnetic field modulus from H band data in units of kGaussdTphys.magField;em.IR.Hfloatu_BH[:] Uncertainty flag on BH (2)meta.code.errorcharo_BH[2/61] Number of spectral lines used to measure BHmeta.numberintBO[4.6/23.6]? Magnetic field modulus from optical data in units of kGaussdTphys.magFieldfloatnullablee_BO[0.03/1.1]? Uncertainty in BOdTstat.errorfloatnullabler_BOReference code for BO (1)meta.ref;pos.framecharo_BO[1/50]? Number of spectral lines used to measure BOmeta.numberintnullableB/mkDisplay data from Skiff (B/mk) within 5"meta.ref.urlintnullableUCAC4Display data from UCAC4 (I/322) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main

J/ApJ/873/L5/table1Effective Lande g Factors; from erratum published in 2019, ApJ, 876, L34Jlow[0/7]? Lower angular momentum quantum numberphys.mol.qn;stat.minfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon designationphys.atmol.ionStagecharWave[15148.35/16911.44] Vacuum wavelength; Angstroms0.1nmem.wldoublelog(gf)[-3.1/1.12]? log oscillator strengthphys.atmol.oscStrengthfloatnullableglow[0.5/3.004]? Lower Lande factorphys.atmol.lande;stat.minfloatnullableElow[0/13.7]? Lower energy valueeVphys.energy;phys.atmol.levelfloatnullableJhigh[0/8]? Upper angular momentum quantum numberphys.mol.qn;stat.maxfloatnullableghigh[0/3.31]? Upper Lande factorphys.atmol.lande;stat.maxfloatnullableEhigh[0.7/14.5]? Upper energy valueeVphys.energy;phys.atmol.levelfloatnullablegeff[0.5/2.15] Effective Lande g factorphys.atmol.landefloate_geff[0.02/0.16] Uncertainty in geffstat.errorfloatN*[1/98] Number of stars usedmeta.numberint