J/ApJ/644/1006ivo://CDS.VizieR/J/ApJ/644/1006doi:10.26093/cds/vizier.16441006CDSBlagrave K.P.M.Martin P.G.Baldwin J.A.2007-11-24T08:58:38Z2007-11-24T09:54:37ZCDS support team

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

cds-question@unistra.frh-ii-regionspre-main-sequence-starsspectroscopyThe spectra of Herbig-Haro objects are usually characteristic of ionization and excitation in shock-heated gas, whether an internal shock in an unsteady outflow or a bow shock interface with the interstellar medium. We examine the easternmost shock the leading optically visible shock of a Herbig-Haro outflow (HH 529) seen projected on the face of the Orion Nebula, using deep optical echelle spectroscopy, showing that the spectrum of this gas is consistent with photoionization by theta^1^ Ori C. By modeling the emission lines, we determine a gas-phase abundance of Fe that is consistent with the depleted (relative to solar) abundance found in the Orion nebula-evidence for the presence of dust in the nebula and therefore in the Herbig-Haro outflow. The spectrum also allows for the calculation of temperature fluctuations, t^2^, in the nebula and the shock. These fluctuations have been used to explain discrepancies between abundances obtained from recombination lines versus those obtained from collisionally excited lines, although to date there has not been a robust theory for how such large fluctuations (t^2^>0.02) can be.2006ApJ...644.1006Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/644/1006CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/644/1006https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/644/1006http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/644/1006https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/644/1006https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/644/1006http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/644/1006GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/644/1006/table1Summary of double Gaussian fits to observed echelle spectraS/NSignal-to-Noise (6)stat.snrfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID? Wavelength identification (1)0.1nmem.wl;phys.atmol.transitiondoublenullablef_ID[ns] nebular or shock componentmeta.codecharIonIon identificationmeta.id;phys.atmol.ionStagecharf_S/N[?] A low S/N (2.6<S/N<5.2) flagmeta.codecharWaveObserved wavelength of line peak (3)0.1nmem.wl;stat.maxdoubleVel? Line velocitykm/sspect.dopplerVelocfloatnullablee_Vel? Uncertainty in Velkm/sstat.errorfloatnullableFWHMLine Full-Width at Half-Maximum (4)km/sspect.line.widthfloate_FWHMUncertainty in FWHMkm/sstat.error;phys.angSizefloatIcorrReddening-corrected surface brightness (5)1e-16W.m**-2.arcsec**-2phot.flux.sbdoublee_IcorrUncertainty in Icorr (5)1e-16W.m**-2.arcsec**-2stat.errorfloatRatio? Shock-to-nebula surface brightness ratio (Is/In) (7)phot.mag.sb;arith.ratiofloatnullablee_Ratio? Uncertainty in Ratiostat.error;arith.ratiofloatnullableNotesAdditional notes (8)meta.notechar