J/ApJ/425/122ivo://CDS.VizieR/J/ApJ/425/122doi:10.26093/cds/vizier.14250122CDSHILL J.K.ISENSEE J.E.CORNETT R.H.BOHLIN R.C.O'CONNELL R.W.,ROBERTS M.S.SMITH A.M.STECHER T.P.1997-12-09T19:50:59Z1997-12-09T20:50:55ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsstellar-associationsultraviolet-astronomyastrometryapparent-magnitudeUV stellar photometry is presented for 1563 stars within a 40' circular field in the LMC, excluding the 10'x10' field centered on R136 investigated earlier by Hill et al. (1993). Magnitudes are computed from images obtained by the Ultraviolet Imaging Telescope in bands centered at 1615A and 2558A. Stellar masses and extinctions are estimated for the stars in associations using the evolutionary models of Schaerer et al. (1993), assuming the age is 4Myr and that the local LMC extinction follows the Fitzpatrick (1985) 30 Dor extinction curve. The estimated slope of the initial mass function (IMF) for massive stars (>15M_{sun}_) within the Lucke and Hodge (LH) associations is {gamma}=-1.08+/-0.2. Initial masses and extinctions for stars not within LH associations are estimated assuming that the stellar age is either 4Myr or half the stellar lifetime, whichever is larger. The estimated slope of the IMF for massive stars not within LH associations is {gamma}=-1.74+/-0.3 (assuming continuous star formation), compared with {gamma}=-1.35, and {gamma}=-1.7+/-0.5, obtained for the Galaxy by Salpeter (1955) and Scalo (1986), respectively, and {gamma}=-1.6 obtained for massive stars in the Galaxy by Garmany, Conti, & Chiosi (1982). The shallower slope of the association IMF suggests that not only is the star formation rate higher in associations, but that the local conditions favor the formation of higher mass stars there. We make no corrections for binaries or incompleteness.1994ApJ...425..122Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/425/122CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/425/122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/425/122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/425/122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/425/122https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/425/122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/425/122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/ApJ/425/122/table2Observed and fitted stellar datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarRunning number of starmeta.id;meta.mainintXX offset from J2000 fiducial position RA=5h 38m 44s, Decl.=-69deg 6' 32"arcsecpos.angDistancefloatYY offset from J2000 fiducial position RA=5h 38m 44s, Decl.=-69deg 6' 32"arcsecpos;arith.difffloatm162B5 band magnitude (1615 A)magphot.mag;em.UV.100-200nmfloatm256A5 band magnitude (2558 A)magphot.mag;em.UV.200-300nmfloatLHLucke and Hodge association number, or zerometa.idintMassFitted masssolMassphys.massfloatE(B-V)Fitted E(B-V) within 30 Dormagphot.color.excessfloatrmsrms magnitude difference between the observations and the best-fit modelmagstat.fit.omc;phot.magfloat