J/A+A/588/A148ivo://CDS.VizieR/J/A+A/588/A148doi:10.26093/cds/vizier.35880148CDSHusser T.-O.Kamann S.Dreizler S.Wendt M.Wulff N.Bacon R.,Wisotzki L.Brinchmann J.Weilbacher P.M.Roth M.M.Monreal-ibero A.2022-03-23T16:26:54Z2019-11-12T15:10:26ZCDS support team

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

cds-question@unistra.frglobular-star-clustersstellar-populationsspectroscopyWe demonstrate the high multiplex advantage of crowded field 3D spectroscopy with the new integral field spectrograph MUSE by means of a spectroscopic analysis of more than 12000 individual stars in the globular cluster NGC 6397. The stars are deblended with a point spread function fitting technique, using a photometric reference catalogue from HST as prior, including relative positions and brightnesses. This catalogue is also used for a first analysis of the extracted spectra, followed by an automatic in-depth analysis via a full-spectrum fitting method based on a large grid of PHOENIX spectra. We analysed the largest sample so far available for a single globular cluster of 18 932 spectra from 12 307 stars in NGC 6397. We derived a mean radial velocity of v_rad_=17.84+/-0.07km/s and a mean metallicity of [Fe/H]=-2.120+/-0.002, with the latter seemingly varying with temperature for stars on the red giant branch (RGB). We determine Teff and [Fe/H] from the spectra, and log g from HST photometry. This is the first very comprehensive Hertzsprung-Russell diagram (HRD) for a globular cluster based on the analysis of several thousands of stellar spectra, ranging from the main sequence to the tip of the RGB. Furthermore, two interesting objects were identified; one is a post-AGB star and the other is a possible millisecond-pulsar companion.2016A&A...588A.148Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/588/A148CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/588/A148https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/588/A148http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/588/A148https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/588/A148https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/588/A148http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/588/A148GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/588/A148/sources (List of stars with spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/588/A148/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/588/A148/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/588/A148/sources?GETtext/xml+votable180.050000true265.1882521-53.70221370.0055555555555555566/42076https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/588/A148?format=asciidefaultJ/A+A/588/A148/sourcesList of stars with spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarID of the star in the photometric reference cataloguemeta.id;meta.mainlongRAJ2000Right ascension (J2000) from "HIERARCH STAR RA" field of the header of spectrum filedegpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000) from "HIERARCH STAR DEC" of the header of spectrum filedegpos.eq.dec;meta.mainindexedmagMagnitude of the star in the photometric filter provided in "HIERARCH PAMPELMUSE PASSBAND" from "HIERARCH STAR MAG" field of the header of spectrum filemagphot.magfloatJ/A+A/588/A148/listList of fits spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification number (1)meta.id;meta.mainlongNxNumber of pixels along X-axismeta.numberintObs.datObservation datestime.epoch;obsnullableblambdaLower value of wavelength interval0.1nmem.wl;arith.difffloatBlambdaUpper value of wavelength interval0.1nmem.wl;arith.difffloatdlambda[1.25] Spectral resolutionspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS file (2)meta.title;meta.fitschar