J/AJ/150/109ivo://CDS.VizieR/J/AJ/150/109doi:10.26093/cds/vizier.51500109CDSRichardson N.D.Gies D.R.Gull T.R.Moffat A.F.J.St-Jean L.2017-12-12T14:44:16Z2016-03-22T16:11:55ZCDS support team

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

cds-question@unistra.frvariable-starsearly-type-starsline-intensitiesWe report on high-resolution spectroscopy of the 2009.0 spectroscopic event of {eta} Carinae collected via SMARTS observations using the CTIO 1.5m telescope and echelle spectrograph. Our observations were made almost every night over a two-month interval around the photometric minimum of {eta} Car associated with the periastron passage of a hot companion. The photoionizing flux of the companion and heating related to colliding winds causes large changes in the wind properties of the massive primary star. Here we present an analysis of temporal variations in a sample of spectral lines that are clearly formed in the wind of the primary star. These lines are affected by a changing illumination of the flux of the secondary star during the periastron passage. We document the sudden onset of blueshifted absorption that occurred in most of the lines near or slightly after periastron, and we argue that these absorption components are seen when we view the relatively undisturbed wind of the foreground primary star. We present time series measurements of the net equivalent width of the wind lines and of the radial velocities of the absorption trough minima and the emission peak midpoints. Most lines decrease in emission strength around periastron, and those high excitation lines formed close to the primary exhibit a red-ward velocity excursion. We show how these trends can be explained using an illuminated hemisphere model that is based on the idea that the emission originates primarily from the side of the primary facing the hot companion.2015AJ....150..109Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/109CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/751/73 : Equivalent widths in {eta} Car in 1998-2012 (Mehner+, 2012)J/A+A/540/A133 : {eta} Car emission spectrum (1700-10400{AA}) (Zethson+, 2012)J/other/NewA/15.108 : {eta} Car UBVRIHa light curves in 2009J/ApJS/181/473 : Analysis of the spectrum of {eta} Car (Nielsen+, 2009)J/ApJS/163/173 : UV spectrum of eta Car in 2003.5 (Gull+, 2006)J/AJ/129/2018 : RXTE scaled fluxes of eta Car (Corcoran+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/109https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/150/109/table2Wind line measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonThe ion identifier (FeII, HeI, H{alpha}, NII, or SiII)phys.atmol.ionStagecharLine[4922/7065]? Line wavelength (in {AA})0.1nmem.wl;spect.lineintnullableHJD[755/1361] Heliocentric Julian Date (HJD-2454000)dtime.epochdoublePhase[11.957/12.256] Phasetime.phasefloatEW[-650.3/1.64]? Equivalent width (in {AA}) (1)0.1nmspect.line.eqWidthdoublenullableVmin[-1028.7/-208.3]? Minimum velocity (2)km/sphys.veloc;stat.minfloatnullableVb[-334.4/150.3]? Estimated bisector velocity (3)km/sphys.velocfloatnullableJ/AJ/150/109/ionsIons/lines listVminMinimum velocity plotmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonThe ion identifierphys.atmol.ionStagecharLine[4922/7065]? Line wavelength (in {AA})0.1nmem.wl;spect.lineintnullableSpSimbad column added by the CDSmeta.numberintnullableEWEquivalent width plotmeta.ref.urlcharVbBisector velocity plotmeta.ref.urlchar