J/AJ/111/846ivo://CDS.VizieR/J/AJ/111/846doi:10.26093/cds/vizier.51110846CDSO'Dell C.R.Wong S.K.2023-04-06T16:50:21Z2006-11-05T16:42:35ZCDS support team

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

cds-question@unistra.frsurveysastrometrypre-main-sequence-starsyoung-stellar-objectsWe report on a survey of the brightest portions of the Orion Nebula made with the Wide Field Planetary Camera 2 of the Hubble Space Telescope. Fifteen paintings were made, each employing interference filters isolating the principal emission lines of HI, [NII], and [OIII] and another isolating an interval similar to the V bandpass. A careful survey of compact objects of stellar and nearly stellar appearance was made and astrometric solutions for individual fields were used to determine positions accurate to about 0.1". 344 stars were measured, down to about V=22. In addition to structures in several of the previously known Herbig-Haro objects, 145 compact sources that can be classified as proplyds were found. Proplyds are young stars surrounded by circumstellar material which is rendered visible by being in or near an HII region. In the central region, where detection of proplyds is easiest, almost all of the low-mass pre-main-sequence stars have obvious circumstellar material. The fraction falls as one views areas away from the dominant photoionizing star {theta}^1^C Ori. Six new dark disk proplyds are found, bringing the total to seven. These are objects showing only in silhouette against the bright background of the HII region. Most of these are elliptical in form, indicating that they are circumstellar disks. In addition to these compact sources, the new images allow detection of numerous large structures previously unreported from ground-based observations. These include shells and shocks apparently related to Herbig-Haro objects and high velocity outflows from young stellar objects.1996AJ....111..846Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/111/846CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/171 : Parenago Catalog of Stars in Orion Nebula (Parenago 1954)J/ApJ/445/280 : ROSAT survey of the Orion nebula region (Gagne+ 1995)J/ApJS/78/239 : Orion stars CO-added IRAS fluxes catalog (Weaver+, 1992)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/111/846https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/111/846http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/111/846https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/111/846https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/111/846http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/111/846GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/111/846/table1 (A listing of all objects in our field that appeared entirely stellar)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/111/846/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/111/846/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/111/846/table1?GETtext/xml+votable180.050000true83.7404167-5.39781940.005555555555555556Cone search capability for table J/AJ/111/846/table2 (A listing of the Non-Stellar objects and the principal information characterizing each object)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/111/846/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/111/846/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/111/846/table2?GETtext/xml+votable180.050000true83.7481667-5.40010560.005555555555555556HST6/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/111/846?format=asciiOpticaldefaultJ/AJ/111/846/table1A listing of all objects in our field that appeared entirely stellarrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[OW94]Star designationmeta.id;meta.maincharRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination (2000)pos.eq.dec;meta.mainJW? Jones & Walker (1988AJ.....95.1755J) numbermeta.idintnullableJ/AJ/111/846/table2A listing of the Non-Stellar objects and the principal information characterizing each objectrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[OW94]Object designationmeta.id;meta.maincharRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination (2000)pos.eq.dec;meta.mainNamesOther designations (1)meta.idcharn_Names[*] Note on F (Felli) names (2)meta.notecharForm[1/7] Form index (3)meta.code;src.morphintn_Form[*] *: semistellar objectsmeta.notecharSizeSize (4)phys.angSizecharNotesNotes (5)meta.notechar