J/MNRAS/457/836ivo://CDS.VizieR/J/MNRAS/457/836doi:10.26093/cds/vizier.74570836CDSEaton J.A.2024-08-15T20:18:16Z2017-01-03T14:42:30ZCDS support team

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

cds-question@unistra.freclipsing-binary-starslate-type-starsline-intensitiesI have reinterpreted Rucinski's line profiles (broadening functions) for the hot A-type W Ursae Majoris binary AW UMa in terms of various contact models, finding that the detached/semidetached geometry he postulates does not fit the system's light variation or its line profiles. The highly overcontact geometry that actually fits the system's ellipsoidal light variation reproduce the total breadth of the lines but give profiles too broad to fit their shapes. The best solution to this dilemma is differential rotation of both stars in which the mid-latitudes are rotating 20-30 per cent slower than synchronously. This approach preserves the traditional light-curve solution and explains the drift of ripples seen in the line profiles. In addition, there are obviously other flows superimposed on the rotation which make the profiles asymmetrical. Fitting the line profiles is complicated by uncertainties in how the equivalent widths of the lines change with effective temperature and how much they are limb darkened. The contribution of any point on the stellar surface to the equivalent width depends only very weakly on local temperature throughout the range of W UMa binaries. The limb darkening of the lines is probably small, although the effect remains unexplored. I also speculate about the nature of hypothetical star-spots in this system.2016MNRAS.457..836Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/457/836CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/457/836https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/457/836http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/457/836https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/457/836https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/457/836http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/457/836GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/457/836/tablea1 (Strengths at MgI b and H{alpha})https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/457/836/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/457/836/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/457/836/tablea1?GETtext/xml+votable180.050000true8.8119986-3.59284360.0055555555555555566/155 188 338 350-351 535 647 684 1779 2075 2317 2381 2476 2923 3208 3639 3783 4316 4670 4895 5009 5196 5304 5377 5531 5731 5802 5853 6147 6154 6273 7390 8451 8466 8635 8822 8845 8935 9125 10090 10263 10375 10562 10741 10899 11620 11856 12330 12864 13136 13440 13802 13966 14693 15021 15906 15962 16105 16302 17137 17425 17611 17860 17965 18636 18666 18734 18888 19585 19766 19912 20127 20145 20365 20390 21568 22189 22300 22708 23190 23230 23382 23523 23678 23921 24924 26457 26975 27822 27973 28252 28494 28593 28643 28664 28988 30220 30529 30995 31073 31101 31433 31751 31760 32067 32158 32757 36664 36742 40692 40823 42464 44284 44879 47468 48169 48254 48302 48613 48768https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/457/836?format=asciidefaultJ/MNRAS/457/836/tablea1Strengths at MgI b and H{alpha}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDStar HD numbermeta.id;meta.mainintSpTypeMK spectral typesrc.spTypecharB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatEWMgIEquivalent width in MgI b band at 5166-5188{AA}0.1nmspect.line.eqWidth;em.opt.BfloatEWHaEquivalent width in H{alpha} band at 6555-6572 {AA}0.1nmspect.line.eqWidth;em.line.HalphafloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main