J/A+A/305/960ivo://CDS.VizieR/J/A+A/305/960doi:10.26093/cds/vizier.33050960CDSChin Y.-N.Henkel C.Whiteoak J.B.Langer N.Churchwell E.B.2013-02-27T06:31:08Z1999-01-06T14:18:20ZCDS support team

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

cds-question@unistra.frradio-astronomyA ^12^C^32^S, ^13^C^32^S, ^12^C^34^S, and ^12^C^33^S J=2-1 line survey has been made to study interstellar ^32^S/^34^S and ^34^S/^33^S ratios from the galactic disk. The four CS isotopomers were detected in 20 star forming regions with galactocentric distances between 3 and 9kpc. From a comparison of line velocities, the C^33^S J=2-1 rest frequency is ~250kHz below the value given in the Lovas (1992) catalog. Taking ^12^C/^13^C ratios from Wilson & Rood (1994) and assuming equal ^12^C^32^S and ^13^C^32^S excitation temperatures and beam filling factors, ^12^C^32^S opacities are in the range 3 to 15; average ^32^S/^34^S and ^34^S/^33^S isotope ratios are 24.4+/-5.0 and 6.27+/-1.01, respectively. While no systematic variation in the ^34^S/^33^S isotope ratio is found, the ^32^S/^34^S ratio increases with galactocentric distance when accounting for the ^12^C/^13^C gradient of the galactic disk. A fit to the unweighted data yields ^32^S/^34^S=3.3+/-0.5(D_GC_/kpc)+4.1+/-3.1 with a correlation coefficient of 0.84. Since the interstellar sulfur (S) isotopes are synthesized by oxygen burning in massive stars, consequences for nucleosynthesis and models of chemical evolution are briefly discussed.1996A&A...305..960Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/305/960CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/305/960https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/305/960http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/305/960https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/305/960https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/305/960http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/305/960GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/305/960/table1 (Line parameters from unsmoothed J=2-1 spectra of the four measured CS isotopomers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/305/960/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/305/960/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/305/960/table1?GETtext/xml+votable180.050000true83.809055-5.3751490.0055555555555555566/21439 41805 41812 41820 42159 42169 42172 42376 42391 42396 42398 42445 42449 42451 42456-42457 42497-42498 43013 43021https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/305/960?format=asciiRadiodefaultJ/A+A/305/960/table1Line parameters from unsmoothed J=2-1 spectra of the four measured CS isotopomersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObjectmeta.notecharRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainMolecMoleculemeta.notecharrmsrms noise of the spectrum in units of Tmb (1)mKstat.stdev;instr.det.noiseintIntTmbIntegral of main beam brightness temperature in the velocityK.km/sphys.temperature;meta.mainfloate_IntTmbError on the integral of main beam brightness temperature in the velocityK.km/sstat.errorfloatTmbMain beam brightness temperatureKobs.paramfloatVLSRLSR velocitykm/sphys.veloc;pos.lsrfloatFWHMFull width to half maximum linewidthskm/sspect.line.widthfloatVel1Lower value of the velocity rangekm/sphys.veloc;instr.bandwidth;stat.minintVel2Upper value of the velocity rangekm/sphys.veloc;instr.bandwidth;stat.maxint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed