J/AJ/147/22ivo://CDS.VizieR/J/AJ/147/22doi:10.26093/cds/vizier.51470022CDSKim J.Cho S.-H.Kim S.J.2026-03-18T20:01:05Z2014-09-03T13:50:50ZCDS support team

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

cds-question@unistra.frinterstellar-masersvariable-starsradio-astronomyBased on the simultaneous observational results of SiO and H_2_O masers toward 401 evolved stars, we have performed statistical analyses. We find that the peak and integrated intensities of SiO masers are stronger than those of H_2_O masers in both Mira variables and OH/IR stars at most optical phases. However, the relative intensity ratios of H_2_O to SiO masers in OH/IR stars are larger than those in Mira variables. Moreover, the intensity ratios of H_2_O to SiO masers are found to be increased around the optical phases from 0-0.4. The H_2_O photon luminosities also tend to be more dependent on the optical phase compared with those of SiO masers. These facts suggest that H_2_O masers are more sensitive to expanding the motion of circumstellar envelopes and also shock waves arising from the pulsations of the central star compared with SiO masers. This result may also be related to the differences in the maser location and pumping mechanism between H_2_O and SiO masers. The full width at zero power of SiO masers in Mira variables shows similar values to those of OH/IR stars, while those of H_2_ O masers in OH/IR stars show larger values than those of Mira variables. These differences may originate from the different mass-loss rates and the different location of the two masers. The mean velocity shift of SiO and H_2_O masers with respect to the stellar velocity was investigated as a function of optical phase. The velocity shift of the H_2_O masers shows that the redshifted emission dominates during the phases from 0.3-0.6, while the blueshifted emission appears at phase 0.6 and coexists with the redshifted emission during other phases. These features show an associated pattern with the CO {Delta}V=3 radial velocity curve, which exhibits a typical pulsation motion. On the other hand, the velocity shift of the SiO v=2 maser shows slightly similar features to the H_2_O maser, while that of SiO v=1 does not show these similar features. Finally, the distributions of all 401 observed sources are investigated in the IRAS two-color diagram in relation to the late evolutionary processes of asymptotic giant branch stars.2014AJ....147...22Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)V/18 : Catalogue of Late-type Stars with Maser Emission (Engels, 1979)J/AJ/145/22 : Simultaneous SiO and H2O maser observations (Kim+, 2013)J/AJ/144/129 : Properties of 83 known stellar SiO maser sources (Cho+, 2012)J/PASJ/64/4 : SiO maser survey of nearby red variables (Deguchi+, 2012)J/ApJ/669/446 : Observations of SiO masers (Nakashima+, 2007)J/PASJ/56/765 : SiO maser survey of IRAS sources (Deguchi+, 2004)J/PASJ/55/203 : SiO maser survey toward inner Galactic disk (Nakashima+, 2003)J/PASJ/55/229 : SiO maser survey of cold IRAS sources (Nakashima+, 2003)J/A+AS/101/153 : Galactic H2O masers (Palagi+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/22https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/147/22/stars (Photon luminosity (Table2) , and velocities (Table3) of detected sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/22/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/22/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/22/stars?GETtext/xml+votable180.050000true0.839421955.68111890.0055555555555555566/220 592 631 958 1345 1493 1619 1889 1892 1986 2031 2500 2528 2687 2694 2990 2994 3061 3209 3262 3265 3272 3285 3446 3491 3640 3666 3765 4028 4355 4472 4614 4892 5647 6161 6251 6803 7119 7152 7619 7631 7673 7827 7919 8297 8405 8475 8532 8603 8926 9074 9091 9258 9423 10635 10806 11017 11712 11747 11866 12137 12363 12382 12556 12686 12703 12802 12833 12954 12979 13047 13207 13245 13338 13463 13623 13666 13683 13795 13813 13845 14196 14301-14302 14306 14308 14314 14336 14371 14399 14415 14428 14454 14457 14550 14595 14623 14657 14674 14685 14811 14834 14936 15044 15105 15458 15593 15620 15640 15680 16023 16088 16132 16224 16232 16335 16459 16594 17192 17716 17763 18364 18998 19279 19293 19586 20212 20272 20477 20626 20715 21050 21333 21376 21523 21647 21671 21710 22051 22144 22156 22161 22271 22333 22434 22556 22806 22954 23394 23471 23488 24151 24381 24448 24453 24500 25246 25407 25544 25553 25798 25864 25986 26070 26180 26327 28113 28188 28685 28812 28826 28868 28875 28880 28917 28919 28981 28998 29043 29096-29097 29112 29115 29123 29161 29290 29304 29310 29387 29430 29474 29476 29504 29508 29520 29528 29533 29539 29550 29597 29611 29701 29705 29817 29866 29877 29963 30034 30069 30087 30120 30189 30209 30218 30220 30222 30244 30247 30265 30310 30316 30333 30397 30404 30416 30434 30449 30481 30494 30497 30543 30602 30605-30606 30614 30616 30618 30622 30624-30625 30627 30636 30640-30641 30661 30684 30705 30715 30733 30787 30795 30801-30802 30856 31007 31086 31190 31194 31231 31292 31458 31464 31552 31610 31805 31828 31832 31837 31849 31938 31944 32015 32074 32117 32259 32314 32322 32439 32527 32614 32622 32723 34292 34576 34792 36028 36311 36320 36322 38701 39371 39724 39755 39793 39803 39899 39905 39916 39933 40235 40246 40422 40533 40686 40688 40847 42439 42483 42489 42833 42840 42895 43494 43864 43890 44018 44170 44309 44417 44464 44511 44546 45009 48006 48038 48301 48650 48715 49132https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/147/22?format=asciiRadiodefaultJ/AJ/147/22/starsPhoton luminosity (Table2) , and velocities (Table3) of detected sourcesSeq[1/166] Source number in previous papermeta.id;meta.numberintFSiO2? Integrated flux for SiO({nu}=2) maser linezW.m**-2phot.flux.density;em.radiofloatnullableFH2O? Integrated flux for H_2_O maser linezW.m**-2phot.fluxfloatnullableLSiO1? Log of photon luminosity for SiO({nu}=1) linelog(ph.s**-1)phys.luminosityfloatnullableLSiO2? Log of photon luminosity for SiO({nu}=2) linelog(ph.s**-1)phys.luminosityfloatnullableLH2O? Log photon luminosity for H_2_O maser linelog(ph.s**-1)phys.luminosityfloatnullablePhase[0/1]? Phase of the optical light curve (1)time.phasefloatnullableDist? Distance to source found in the literaturepcpos.distance;pos.heliocentricfloatnullabler_Dist? Reference flag for Dist; in refs.dat filemeta.ref;pos.frameintnullableWSiO1? SiO {nu}=1 maser line FWZP (1)km/sspect.dopplerVelocfloatnullableWSiO2? SiO {nu}=2 maser line FWZP (1)km/sspect.dopplerVelocfloatnullableWH2O? H_2_O maser maser line FWZP (1)km/sspect.dopplerVelocfloatnullableH2O/SiO? Ratio of H_2_O to SiO {nu}=1 maser linesphot.flux;arith.ratiofloatnullableVSiO1? SiO {nu}=1 maser line mean velocity (2)km/sspect.dopplerVelocfloatnullableVSiO2? SiO {nu}=2 maser line mean velocity (2)km/sspect.dopplerVelocfloatnullableVH2O? H_2_O maser line mean velocity (2)km/sspect.dopplerVelocfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPapPrevious paper (I, II, or III) (G1)meta.bibnullableNameSource namemeta.id;meta.maincharFSiO1? Integrated flux for SiO({nu}=1) maser linezW.m**-2phot.flux.density;em.radiofloatnullableJ/AJ/147/22/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharCatVizieR catalogmeta.id;meta.tablechar