J/A+AS/147/5ivo://CDS.VizieR/J/A+AS/147/5CDSMiroshnichenko A.S.Chentsov E.L.Klochkova V.G.Kuratov K.S.,Sheikina T.A.Mukanov D.B.Bjorkman K.S.Gray R.O.Rudy R.J.,Lynch D.K.Mazuk S.Puetter R.Garcia-Lario P.Perea J.V.Bergner Yu.K.2000-11-19T08:14:55Z2000-11-19T09:14:50ZCDS support team

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

cds-question@unistra.frb-starsemission-line-starsline-intensitiesradial-velocityWe present the results of low- and high-resolution spectroscopic and multicolour photometric observations of two early-type emission-line stars, AS 78 and MWC 657. They were identified by Dong & Hu (1991ChA&A..15..275D) with the IRAS sources 03549+5602 and 22407+6008, respectively, among many other sources displaying a very strong infrared excess, V-[25]>=8mag. AS 78 is recognized as a photometric variable for the first time. A large near-IR excess radiation is detected in AS 78 and confirmed by new, higher-quality, data for MWC 657. Significant variations in the Balmer line profiles are detected for both objects. Modelling of the Balmer line profiles of AS 78 obtained in 1994 yields the following parameters of the star and its wind: T_eff_~17000K, logL_bol_/L_{sun}_~4.0, dM/dt~10^-6^M_{sun}_/yr. The photometric and new spectroscopic data indicate that the star's T_eff_ increases with time, while the stellar wind changes its structure. Distances towards both objects are estimated on the basis of their radial velocities and the galactic rotation curve. Consideration of different options about the nature and evolutionary state of both objects leads us to suggest that they are binary systems containing a B-type intermediate-luminosity star and a gaseous disk around the less luminous component.2000A&AS..147....5Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/147/5CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/147/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/147/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/147/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/147/5https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/147/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/147/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/147/5/table9Lines identified in the optical spectra of AS 78 and MWC 657Note3Note on lines (3)meta.notecharEW3? AS 78 equivalent width (1999 SAO)0.1nmspect.line.eqWidthfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdentLine identifications (1)meta.idcharLambdaLabLaboratory wavelength0.1nmem.wl;phys.atmol.transitiondoubleIpeak1? MWC 657 peak intensity for the line normalized to the continuum (1994 OHP)spect.line.intensityfloatnullableu_Ipeak1Uncertainty flag on Ipeak1 (2)meta.code.errorcharHRV1? MWC 657 heliocentric radial velocity (1994 OHP)km/sphys.veloc;pos.heliocentricintnullableu_HRV1Uncertainty flag on HRV1 (2)meta.code.errorcharEW1? MWC 657 equivalent width (1994 OHP)0.1nmspect.line.eqWidthfloatnullableNote1Note on lines (3)meta.notecharIpeak2? MWC 657 Peak intensity for the line normalized to the continuum (1999 SAO)spect.line.intensityfloatnullableu_Ipeak2Uncertainty flag on Ipeak2 (2)meta.code.errorcharHRV2? MWC 657 heliocentric radial velocity (1999 SAO)km/sphys.veloc;pos.heliocentricintnullableu_HRV2Uncertainty flag on HRV2 (2)meta.code.errorcharEW2? MWC 657 equivalent width (1999 SAO)0.1nmspect.line.eqWidthfloatnullableNote2Note on lines (3)meta.notecharIpeak3? AS 78 peak intensity for the line normalized to the continuum (1999 SAO)spect.line.intensityfloatnullableu_Ipeak3Uncertainty flag on Ipeak3 (2)meta.code.errorcharHRV3? AS 78 heliocentric radial velocity (1999 SAO)km/sphys.veloc;pos.heliocentricintnullableu_HRV3Uncertainty flag on HRV3 (2)meta.code.errorchar