J/ApJ/710/L30ivo://CDS.VizieR/J/ApJ/710/L30doi:10.26093/cds/vizier.17109030CDSArias J.I.Barba R.H.Gamen R.C.Morrell N.I.Apellaniz J.M.,Alfaro E.J.Sota A.Walborn N.R.Bidin C.M.2017-06-21T08:22:55Z2012-04-18T11:54:18ZCDS support team

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

cds-question@unistra.fro-starsmultiple-starsspectroscopyradial-velocityWe present the analysis of high-resolution optical spectroscopic observations of the zero-age main-sequence O star Herschel 36 spanning six years. This star is definitely a multiple system, with at least three components detected in its spectrum. Based on our radial-velocity (RV) study, we propose a picture of a close massive binary and a more distant companion, most probably in wide orbit about each other. The orbital solution for the binary, whose components we identify as O9V and B0.5V, is characterized by a period of 1.5415+/-0.0006 days. With a spectral type O7.5V, the third body is the most luminous component of the system and also presents RV variations with a period close to 498 days. Some possible hypotheses to explain the variability are briefly addressed and further observations are suggested.2010ApJ...710L..30Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/710/L30CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/116 : Galactic O star catalog (Maiz-Apellaniz+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/710/L30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/710/L30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/710/L30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/710/L30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/710/L30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/710/L30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/710/L30/table1Radial-velocity measurements of the stellar components observed in the spectra of Herschel 36SeqSpectrum numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleHeIIRVA? Component A HeII 4686 radial velocity (1)km/sspect.dopplerVelocfloatnullableHeIIRVB1? Component B1 HeII 4686 radial velocity (1)km/sspect.dopplerVelocfloatnullableHeIRVA? Component A HeI 5876 radial velocity (1)km/sspect.dopplerVelocfloatnullableHeIRVB1? Component B1 HeI 5876 radial velocity (1)km/sspect.dopplerVelocfloatnullableHeIRVB2? Component B2 HeI 5876 radial velocity (1)km/sspect.dopplerVelocfloatnullableObsObservatory/Telescope (Casleo-2.15, ESO-2p2, LCO-Clay or LCO-DP)meta.id;instrcharSpecSpectrograph (Echelle, FEROS, MIKE or REOSC)meta.id;instrchar