J/ApJ/769/20ivo://CDS.VizieR/J/ApJ/769/20doi:10.26093/cds/vizier.17690020CDSYung B.H.K.Nakashima J.-I.Imai H.Deguchi S.Henkel C.Kwok S.2017-10-16T14:58:10Z2015-01-09T10:35:19ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyinfrared-photometrygiant-starsWe present the results of a 22GHz H_2_O maser survey toward a new sample of asymptotic giant branch (AGB) and post-AGB star candidates. Most of the objects are selected for the first time based on the AKARI data, which have high flux sensitivity in the mid-infrared ranges. We aim at finding H_2_O maser sources in the transient phase between the AGB and post-AGB stages of evolution, where the envelopes start to develop large deviations from spherical symmetry. The observations were carried out with the Effelsberg 100m radio telescope. Among 204 observed objects, 63 detections (36 new) were obtained. We found four objects that may be "water fountain" sources (IRAS 15193+3132, IRAS 18056-1514, OH 16.3-3.0, and IRAS 18455+0448). They possess an H_2_O maser velocity coverage much smaller than those in other known water fountains. However, the coverage is still larger than that of the 1612MHz OH maser. It implies that there is an outflow with a higher velocity than the envelope expansion velocity (typically <=25km/s), meeting the criterion of the water fountain class. We suggest that these candidates are possibly oxygen-rich late AGB or early post-AGB stars in a stage of evolution immediately after the spherically symmetric AGB mass loss has ceased.2013ApJ...769...20Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/769/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)J/ApJ/741/94 : VLBA obs. of H20 maser in IRAS 18286-0959 (Yung+, 2011)J/PASJ/62/525 : SiO maser survey off the Galactic Plane (Deguchi+, 2010)J/ApJ/678/96 : Extragalactic H2O masers (Braatz+, 2008)J/ApJ/669/446 : Observations of SiO masers (Nakashima+, 2007)J/ApJ/669/424 : H2O maser emissions of IRAS 19134+2131 (Imai+, 2007)J/ApJ/658/1096 : H2O maser classification (Deacon+, 2007)J/PASJ/56/765 : SiO maser survey of IRAS sources (Deguchi+, 2004)J/PASJ/55/229 : SiO maser survey of cold IRAS sources (Nakashima+, 2003)J/PASJ/55/203 : SiO maser survey toward inner Galactic disk (Nakashima+, 2003)J/A+A/366/481 : ATCA/VLA OH 1612 MHz survey. III. (Sevenster+, 2001)J/A+AS/127/185 : SiO masers in OH/IR stars, proto-PN and PN (Nyman+ 1998)J/A+AS/119/459 : Search for OH maser emission (te Lintel Hekkert+ 1996)J/ApJS/106/463 : SiO maser sources (Jiang+ 1996)J/A+A/299/755 : Stellar evolution. II. Post-AGB (Bloecker+, 1995)J/A+AS/111/237 : OH detections from circumstellar shells (Lewis+, 1995)J/ApJS/93/549 : Arecibo 1612 MHz survey supplement (Lewis 1994)J/ApJS/89/189 : IRAS PSC new OH/IR stars. III. (Chengalur+ 1993)J/A+A/277/453 : OH maser survey of cool IRAS sources (David+ 1993)J/A+AS/90/327 : IRAS point source 1612MHz OH survey (te Lintel Hekkert+ 1991)http://www.ir.isas.jaxa.jp/AKARI/Observation/PSC/Public/ : AKARI PS cat.https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/769/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/769/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/769/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/769/20https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/769/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/769/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/769/20/table1 (Parameters of the observing targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/769/20/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/769/20/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/769/20/table1?GETtext/xml+votable180.050000true0.027333325.88644440.0055555555555555566/194 1482 1833 3178 3491 3505 3602 3753 3765 4654 8297 9074 9233 9713 11605 12329 12334 12706 12834 12855 12944 12970 12972 12987 12992 12998 12999 13002 13036 13050 13055 13283 13514 13903 13917 14011 14140 14175 14214 14218 14241 14248 14260 14270 14289 14293 14302 14314 14316 14323 14325 14331 14337 14340 14348 14352 14364 14416 14419 14450 14453 14549 14567 14602 14622 14624 14644 14664 14666 14732 14796 14808 15363 15370 15410 15422 15429 15469 15508 15510 15620 15624 15657 15660 15663 15665 15676 15718 15719 15720 15748 15817 15820 15939 15940 15965 16042 16197 16320 16335 20156 20272 22243 23640 23674 23801 24167 24356 25986 29112 29115 29154 29458 29460 29462 29471 29473 29507 29511 29517 29522 29529 29533 29556 29565 29589 29611 29656 30244 30250 30269 30297 30306 30316 30318 30321 30330 30332 30333 30363 30366 30385 30423 30426 30449 30494 30506 30592 30594 30595 30600 30605 30606 30607 30625 30629 30635 30640 30641 30643 30644 30645 30646 30669 30671 30682 30687 30698 30709 30715 30717 30908 30979 30994 31034 31086 31301 31670 31766 31775 31817 31840 31847 31886 31888 31922 32066 32073 32093 32101 32117 32182 32519 32543https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/769/20?format=asciiInfraredRadiodefaultJ/ApJ/769/20/table1Parameters of the observing targetsNameObject namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDSimbad column added by the CDSmeta.ref.urlintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainIC12? IRAS [12]-[25] micron band color indexphot.color;em.IR;em.IRfloatnullableIC23? IRAS [25]-[60] micron band color indexphot.color;em.IR;em.IRfloatnullableAC12? AKARI [09]-[18] micron band color indexphot.color;em.IR;em.IRfloatnullableAC23? AKARI [18]-[65] micron band color indexphot.color;em.IR;em.IRfloatnullableVOHb[-95/135]? Local Standard of Rest velocity of blueshifted OH maser profile (1)km/sphys.veloc;pos.lsrfloatnullablef_VOHb[N] Non-detection of VOHb (2)meta.codecharVOHr? Local Standard of Rest velocity of redshifted OH maser profile (1)km/sphys.veloc;pos.lsrfloatnullablef_VOHr[Ni] Note on VOHr (2)meta.codecharRef1? Reference for OH maser velocities (see refs.dat file)meta.ref;pos.frameintnullableVSiO1[-74/186]? Local Standard of Rest velocity of SiO (v=1,J=1-0) maser peakphys.veloc;pos.lsrfloatnullablef_VSiO1[Nj] Note on VSiO1 (2)meta.codecharVSiO2? Local Standard of Rest velocity of SiO (v=2,J=1-0) maser peakphys.veloc;pos.lsrfloatnullablef_VSiO2[N] Non-detection of VSiO2 (2)meta.codecharRef2Reference(s) for SiO maser velocities (see refs.dat file)meta.ref;pos.framecharCat[a-h] Source category (3)meta.code.classcharAKARIDisplay the AKARI MIR (II/297) within 5"meta.ref.urlintnullableIRASDisplay the IRAS point source catalog (II/125) within 30"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/769/20/table3Parameters of the H2O maser detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharVbp[-123/73.5] VLSR of the blueshifted peak of a double-peaked profile (1)km/sphys.veloc;stat.maxfloatFbp[0.06/75.6] Flux density of the blueshifted peak of a double-peaked profile (1)Jyphot.fluxfloatVrp[-65/107]? VLSR of the redshifted peak of a double-peaked profile (1)km/sphys.veloc;stat.maxfloatnullableFrp[0.2/390]? Flux density of the redshifted peak of a double-peaked profile (1)Jyphot.fluxfloatnullableVbe[-123/70] VLSR of the two ends of the whole emission profile (2)km/sphys.veloc;pos.lsrintVre[-80/171] VLSR of the two ends of the whole emission profile (2)km/sphys.veloc;pos.lsrintSe[0.3/1021] Integrated flux of the whole emission profileJy.km/sphot.fluxfloatrms[1.4/7.1] rms noise level0.01Jyinstr.det.noisefloatRefReference(s) for known detections (see refs.dat file)meta.ref;pos.framecharJ/ApJ/769/20/table4Parameters of the non-detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharrms[2.3/9.3] rms noise level (in 10^-2^Jy)cJyinstr.det.noisefloatJ/ApJ/769/20/refsReferencesRefReference codemeta.noteintAutAuthor's name(s)meta.bib.authorcharCommCommentmeta.notecharBibCodeBibcodemeta.bib.bibcodecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint