J/AJ/106/66ivo://CDS.VizieR/J/AJ/106/66doi:10.26093/cds/vizier.51060066CDSLee M.G.Madore B.F2023-04-06T16:50:05Z1997-12-09T20:15:15ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometrygalaxiesphotometryWe present BVRI CCD photometry of ~600 stars in the central region of a resolved spiral galaxy NGC 1560 which is seen almost edge-on, apparently located in the IC 342 group. The V-(B-V) diagram shows a dominant group of significantly reddened blue plume stars consisting of young massive main-sequence and evolved blue supergiant stars. The tip of the blue plume is found to be at V~21 mag and (B-V)~0.4mag. The I-(R-I) diagram shows a large group of red supergiants the brightest of which are extending to I~19.5mag at (R-I)~1.1mag. The logarithmic slope of the V luminosity function of the blue plume stars is 0.69+/-0.10, similar to that for other nearby galaxies. The mean color of the blue plume stars is <(B-V)>=0.25+/-0.03mag. The total reddening, including both foreground and internal reddening, is estimated from the mean color of the blue plume stars, to be E(B-V)=0.40+/-0.10mag, whereas the foreground reddening based on the H I column density and faint galaxy counts is E(B-V)=0.16mag. Combining our results with those in the literature, we have obtained distance estimates using four methods: brightest blue stars [(m-M)_0_=27.11mag], brightest red stars [(m-M)_0_=27.02mag], B-band Tully-Fisher relation [(m-M)_0_=26.96mag], and H-band Tully-Fisher relation [(m-M)_0_=26.86mag]. These four estimates agree very well. Taking the average of these four estimates, we obtain a value for the true distance modulus to NGC 1560, (m-M)_0_=27.0+/-0.1mag, corresponding to a distance of 2.5+/-0.1Mpc.1993AJ....106...66Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/106/66CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/106/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/106/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/106/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/106/66https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/106/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/106/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/106/66/table2BVRI CCD photometry of stars in NGC 1560recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNoStar numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detfloatYposY positionpixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-R? V-R colour indexmagphot.color;em.opt.V;em.opt.RfloatV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatImag? I magnitudemagphot.mag;em.opt.Ifloat