J/AJ/117/446ivo://CDS.VizieR/J/AJ/117/446doi:10.26093/cds/vizier.51170446CDSChen Y.Yao Y.Yang J.Hirao T.Ishii M.Nagata T.Sato S.2023-04-06T16:50:34Z2000-02-19T21:45:54ZCDS support team

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

cds-question@unistra.frnebulaeinfrared-photometrypre-main-sequence-starsWe present near-infrared images of the star-forming region AFGL 5157 in the JHK broadband filters and H_2_v=1-0S(1) narrowband filter. The images reveal a dense cluster of stars and infrared nebulosities associated with previously known infrared sources. Of 54 near-infrared sources detected in the nebula, NGC 1985, 12 exhibit infrared excesses typical of T Tauri stars, Herbig Ae/Be stars, and protostars. The magnitude and color distribution of the cluster of stars in the nebula are found to be different from those outside the nebular region. The K'-magnitude distribution of the cluster is quite flat, while the noncluster is peaked toward the low magnitude. The [H-K'] color of the cluster also displays 0.3 mag redder than that of the noncluster. The infrared nebula displays a bright nucleus with two spirals extended to the north and south. In light of the color properties of the nebula, we propose a shell model for the nebular structure that could be formed by star-forming activity of the central cluster.1999AJ....117..446Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/117/446CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/117/446https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/117/446http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/117/446https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/117/446https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/117/446http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/117/446GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/117/446/table1 (Near-infrared photometry of AFGL 5157)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/117/446/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/117/446/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/117/446/table1?GETtext/xml+votable180.050000true84.430792232.02622890.005555555555555556Cone search capability for table J/AJ/117/446/table2 (Positions and flux measurements of H_2_ emission in AFGL 5157)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/117/446/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/117/446/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/117/446/table2?GETtext/xml+votable180.050000true84.450510632.00277810.0055555555555555566/244999.362106217279594e-20 9.362106217279594e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/117/446?format=asciiInfrareddefaultJ/AJ/117/446/table1Near-infrared photometry of AFGL 5157recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNIRS[1/170] Identification number ([CYY99] NIRS NNN in Simbad)meta.id;meta.mainintoRAOffset in right ascension (G1)arcsecpos.eq.ra;arith.difffloatoDEOffset in declination (G1)arcsecpos.eq.dec;arith.difffloatK'magK' magnitudemagphot.mag;em.IR.Kfloat[H-K']Colour index [H-K']magphot.color;em.IR.H;em.IR.Kfloat[J-H]? Colour index [J-H]magphot.color;em.IR.J;em.IR.Hfloatnullable_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=0.15'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=0.15'') (declination part)degpos.eq.dec;meta.mainn_NIRS[b] saturation (1)meta.notecharJ/AJ/117/446/table2Positions and flux measurements of H_2_ emission in AFGL 5157recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintH2[1/22]? H_2_ knot designation ([CYY99] H2 NN in Simbad)meta.id;meta.mainintnullablen_H2[D] D: Diffuse (no H2 number)meta.notecharoRAOffset in right ascension (G1)arcsecpos.eq.ra;arith.difffloatoDEOffset in declination (G1)arcsecpos.eq.dec;arith.difffloatFluxH_2_ knots (2.12{mu}m) flux1e-20W.cm**-2.um**-1phot.fluxfloatAperAperture employed for H_2_ measurementsarcsecphys.angSize;instr.fovintFWHM? H_2_ knots FWHM sizearcsecphys.angSizefloatnullableMorphMorphology (2)src.morphcharRef[1/2] References (3)meta.refint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=0.15'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=0.15'') (declination part)degpos.eq.dec;meta.main