J/A+A/602/A71ivo://CDS.VizieR/J/A+A/602/A71doi:10.26093/cds/vizier.36020071CDSShagatova N.Skopal A.2017-07-03T13:45:38Z2017-06-15T12:24:03ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsspectroscopyultraviolet-astronomyLight curves (LCs) of some symbiotic stars show a different slope of the ascending and descending branch of their minimum profile. The origin of this asymmetry is not well understood. We explain this effect in the ultraviolet LCs of the symbiotic binary SY Mus. We model the continuum fluxes in the spectra obtained by the International Ultraviolet Explorer at ten wavelengths, from 1280 to 3080{AA}. We consider that the white dwarf radiation is attenuated by H^0^ atoms, H^-^ ions, and free electrons in the red giant wind. Variation in the nebular component is approximated by a sine wave along the orbit as suggested by spectral energy distribution models. The model includes asymmetric wind velocity distribution and the corresponding ionization structure of the binary. We determined distribution of the H^0^ and H^+^, as well as upper limits of H^-^ and H^0^ column densities in the neutral and ionized region at the selected wavelengths as functions of the orbital phase. Corresponding models of the LCs match well the observed continuum fluxes. In this way, we suggested the main UV continuum absorbing (scattering) processes in the circumbinary environment of S-type symbiotic stars. The asymmetric profile of the ultraviolet LCs of SY Mus is caused by the asymmetric distribution of the circumstellar matter at the near-orbital-plane area.2017A&A...602A..71Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/602/A71CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/317/712 : UV fluxes and electron density of AG Peg (Altamore+ 1997)J/A+A/333/658 : D-type symbiotic stars emission line fluxes (Pereira+ 1998)J/MNRAS/383/845 : Spectroscopy of AE Circinus (Mennickent+, 2008)J/AN/333/242 : Recent photometry of symbiotic stars (Skopal+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/602/A71https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/602/A71http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/602/A71https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/602/A71https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/602/A71http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/602/A71GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/A+A/602/A71/table1*UV continuum fluxes of SY MusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintphiOrbital phasetime.phasefloatlogF1280Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1280{AA}log(10mW.m**-2)phot.fluxfloate_logF1280Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1280{AA}log(10mW.m**-2)stat.errorfloatE_logF1280Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1280{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF1340Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1340{AA}log(10mW.m**-2)phot.fluxfloate_logF1340Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1340{AA}log(10mW.m**-2)stat.errorfloatE_logF1340Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1340{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF1450Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1450{AA}log(10mW.m**-2)phot.fluxfloate_logF1450Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1450{AA}log(10mW.m**-2)stat.errorfloatE_logF1450Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1450{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF1520Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1520{AA}log(10mW.m**-2)phot.fluxfloate_logF1520Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1520{AA}log(10mW.m**-2)stat.errorfloatE_logF1520Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1520{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF1600Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1600{AA}log(10mW.m**-2)phot.fluxfloate_logF1600Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1600{AA}log(10mW.m**-2)stat.errorfloatE_logF1600Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1600{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF1800Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1800{AA}log(10mW.m**-2)phot.fluxfloate_logF1800Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1800{AA}log(10mW.m**-2)stat.errorfloatE_logF1800Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1800{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF1950Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1950{AA}log(10mW.m**-2)phot.fluxfloate_logF1950Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1950{AA}log(10mW.m**-2)stat.errorfloatE_logF1950Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=1950{AA}log(10mW.m**-2)stat.error;stat.maxfloatlogF2400? Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=2400{AA}log(10mW.m**-2)phot.fluxfloatnullablee_logF2400? Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=2400{AA}log(10mW.m**-2)stat.errorfloatnullableE_logF2400? Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=2400{AA}log(10mW.m**-2)stat.error;stat.maxfloatnullablelogF2700? Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=2700{AA}log(10mW.m**-2)phot.fluxfloatnullablee_logF2700? Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=2700{AA}log(10mW.m**-2)stat.errorfloatnullableE_logF2700? Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=2700{AA}log(10mW.m**-2)stat.error;stat.maxfloatnullablelogF3080? Logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=3080{AA}log(10mW.m**-2)phot.fluxfloatnullablee_logF3080? Negative value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=3080{AA}log(10mW.m**-2)stat.errorfloatnullableE_logF3080? Positive value error of the logarithm of [continuum flux in erg/cm^2^/s/{AA}) over 1 erg/cm^2^/s/{AA})] at {lambda}=3080{AA}log(10mW.m**-2)stat.error;stat.maxfloatnullableMJDModified Julian Datedtime.epochintSWPNumber of the IUE SWP spectrummeta.numberintLWP/LWR? Number of the IUE LWP or LWR spectrummeta.numberintnullable