J/A+A/281/161ivo://CDS.VizieR/J/A+A/281/161doi:10.26093/cds/vizier.32810161CDSAltenhoff W.J.Thum C.Wendker H.J.2017-06-20T13:16:19Z2008-04-09T17:58:40ZCDS support team

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

cds-question@unistra.frradio-astronomyob-starswolf-rayet-starsearly-type-starspre-main-sequence-starsgiant-starssupergiant-starsvariable-starsWe have used the IRAM 30 m-telescope together with the Max Planck Institute for Radio Astronomy (MPIfR) bolometer to survey nearly 270 stars of different types for 250GHz continuum emission. We compare these data with their low frequency (cm-range) properties. Early type stars show very often a deviation from the uniformly expanding wind model which we tentatively attribute to temperature and/or density fluctuations in their deeper atmospheric layers. For WR stars this deviation seems to depend on the effective temperature. Pre-main sequence stars usually seem to be surrounded by a shell of warm dust making a substantial contribution to the 250 GHz flux density value. We have found especially for nearby giants and supergiants that a layer at the transition from photosphere to chromosphere emits ample 250 GHz radiation. We show that the present data can still be explained by a simple uniformly illuminated disk model with the known stellar radius. Optically variable stars are not very strong emitters at 250 GHz. We preferentially detected the more exotic ones, a few Beta Lyr-type and symbiotic stars. Comments on many individual objects are given in the appropriate sections.1994A&A...281..161Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/281/161CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/281/161https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/281/161http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/281/161https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/281/161https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/281/161http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/281/161GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/281/161/radiostars (Radio emission from stars at 250GHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/281/161/radiostars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/281/161/radiostars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/281/161/radiostars?GETtext/xml+votable180.050000true1.015806762.22195030.005555555555555556Cone search capability for table J/A+A/281/161/table9 (Stars with determined radii)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/281/161/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/281/161/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/281/161/table9?GETtext/xml+votable180.050000true17.43301535.62055780.0055555555555555566/15 254 342 845 1015 1031 1051 1054 1073-1075 1111 1143 1159 1168-1169 1171 1231 1399 1427 1460 1504 1704 1922 2248 2282 2460 3029 3054 3138 3229 3275 3283 3308 3324 3430 3616 3642 3723 3849 4095 4355 4365 4444 4972 4990 5273 5420 5647 5718 6126 6219 6241 6517 6897 7684 7752 8532 8669 8767 8790 8821 8926 9442 9717 9783 9813 10055 10255 10305 10474 10481 11764 11958-11959 12082 12544 12551 12748 13282 13286 13392 13721 13778 13797 13813 13933 13947 14007-14008 14110 14115 14255 14280 14373 14409 14431 14452-14453 14457 14484 14619 14621 14629-14632 14640-14641 14646 14649 14670 14674 14689-14690 14692 14727 14788 14797 14808 14855 14878 14906-14907 14968 15090 15135 15243 15364 15401 15478 15569 15628 15633 15650 15667 15749 15759 17192 17256 17368 17716 17989 18309 18889 18978 19045 19556 19567 20102 20205 20286 20761 20764 20826 20940 21436 21438 21530 21643 22243 22289 22300 22707 22787 22854 22862 23191 23540 23547 23549 23551 23611 23636-23637 23652 23704 23798 23922 23983 23995-23996 24048 24151 24164 24201 24337 24449 24799 25659 26320 27498 28364 28803 28825 28879 28890 28913 28921 28977 29090 29097 29162 29306 29463 29505 29507 29513 29574 29664 30029 30128 30506 30567 30574 30606 30615 30687 30709 30741 30753 30803 31475 31781 32085 32271 32516 33521 33657 33742 36526 39327 39864 39893 39905 40321 40795 42477 42484 42779 42956 42981 42994 44018 47014 48737https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/281/161?format=asciiRadiodefaultJ/A+A/281/161/radiostarsRadio emission from stars at 250GHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStSimbad column added by the CDSsrc.classcharNameStar namemeta.id;meta.maincharSpTypeMK spectral type (table8 only)src.spTypecharl_S(250)Limit flag on S(250)meta.code.errorcharS(250)? Flux in continuum at 250GHzmJyphot.flux.density;em.mm.200-400GHzfloatnullablee_S(250)? rms uncertainty on S(250)mJystat.errorfloatnullableSessList of session numbersmeta.id;obscharl_alf[><~] Limit flag on spectral indexmeta.code.errorcharalf? Spectral index (S({nu}){prop.to}{nu}^-{alf}^)spect.indexfloatnullablee_alf? rms uncertainty on spectral indexstat.errorfloatnullableu_alf[?] Uncertainty flag on alfmeta.code.errorcharRemRemarksmeta.notecharSimbadNameSimbad column added by the CDSmeta.idchar_RAComputed Right Ascension for Equinox: J2000degpos.eq.ra;meta.mainnullable_DEComputed Declination for Equinox: J2000degpos.eq.dec;meta.mainnullableJ/A+A/281/161/table9Stars with determined radiirecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharSpTypeMK spectral typesrc.spTypecharR(UD)Stellar radiusmasphys.angSizefloatRefsReferences (1)meta.ref;pos.framecharl_S(250)Limit flag on S(250)meta.code.errorcharS(250)Flux in continuum at 250GHzmJyphot.flux.density;em.mm.200-400GHzfloatl_T(disk)Limit flag on disk temperaturemeta.code.errorcharT(disk)Disk temperatureKphys.temperatureintSimbadNameSimbad column added by the CDSmeta.idchar_RAComputed Right Ascension for Equinox: J2000degpos.eq.ra;meta.mainnullable_DEComputed Declination for Equinox: J2000degpos.eq.dec;meta.mainnullable