J/A+A/373/608ivo://CDS.VizieR/J/A+A/373/608doi:10.26093/cds/vizier.33730608CDSDufton P.L.Smartt S.J.Hambly N.C.2001-09-15T12:11:17Z2001-09-15T12:11:05ZCDS support team

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

cds-question@unistra.frearly-type-starsphotometryline-intensitiesWe are searching for early-type stars towards the Galactic centre which are potentially young objects situated within the inner few kiloparsecs of the disk. Photographic photometry from the UK Schmidt Telescope has been used to identify the bluest candidates in nineteen Schmidt fields (centred close to the Galactic centre). We have previously obtained FLAIR low dispersion spectroscopy for three of these fields to estimate spectral types and here we present spectroscopy for an additional seven fields. Combining the results for all ten fields, 56 stars were initially classified as early-B type. Estimates of the equivalent widths of their Balmer and He I lines have been used to estimate atmospheric parameters and 32 targets have effective temperatures greater than or equal to 17000K (corresponding to a spectral type of B3 or earlier). The spectra of seven of these targets also have absorption lines due to O II and Si III and can be reliably classified as early-B type. Additionally 78 stars have estimated effective temperatures between 11000 and 16000K with a further 50 objects identified as late-B (or early-A) type. All but two of the early B-type candidates have magnitudes in the range 12.0<=V<=16.0, and our best estimates of their distance suggest that they could be close to (i.e. R_g_<3kpc), or even beyond the Galactic centre.2001A&A...373..608Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/373/608CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/139/231 : Early-type stars towards the Galactic Centre (Dufton+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/373/608https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/373/608http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/373/608https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/373/608https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/373/608http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/373/608GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/373/608/table1 (The 10 Galactic Centre Survey fields for which spectroscopy has been obtained.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/373/608/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/373/608/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/373/608/table1?GETtext/xml+votable180.050000true266.9208-45.01670.005555555555555556Cone search capability for table J/A+A/373/608/t2_8 (Blue stellar candidates for the 7 fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/373/608/t2_8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/373/608/t2_8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/373/608/t2_8?GETtext/xml+votable180.050000true264.5019583-45.03722220.0055555555555555565/7199 7224 7231 7264 7268-7269 7271 7312 10567 10578 10590 10609 6/28778 28790-28791 28795 28800 28842 28853 28855 28863 28884-28885 28887 28893 28905 28907 28910 28919 28921 28963 28969 28971-28972 28974 28986-28988 28990-28991 29060 29064 29081 29083 29096 29098 29108 29120 29122 29128 29252 29265 29268 29270 29272-29273 29278 29440 29442-29443 42263 42293 42305 42308-42310 42316-42318 42321-42323 42328 42337 42341 42343 42348-42350 42352 42354 42429-42431 42441 42444 42448-42450 42467 42472-42474 42476 42478 42773 42780-42781 42816-42817 42819-42822 42824 47754https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/373/608?format=asciiOpticaldefaultJ/A+A/373/608/table1The 10 Galactic Centre Survey fields for which spectroscopy has been obtained.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField number (1)obs.fieldintprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBlueBlue Exposure timeshtime.duration;obs.exposurefloatRed? Red Exposure timeshtime.duration;obs.exposurefloatnullableJ/A+A/373/608/t2_8Blue stellar candidates for the 7 fieldsBlueSpBlue spectra classificationsrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField numberobs.fieldintStarStar number in the field ([DSH2001] FFF-NN in Simbad)meta.idintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloat(u-v)(u-v) colour indexmagphot.color;em.opt.U;em.opt.VfloatCb? Mean count in the summed spectra for the wavelength ranges 3900 to 4600{AA} (blue)phot.count;em.optintnullableCr? Mean count in the summed spectra for the wavelength ranges 5600 to 6800{AA} (red)phot.count;em.optintnullableRedSpRed spectra classificationsrc.spTypechar