000002767 001__ 2767
000002767 005__ 20160701171710.0
000002767 037__ $$aASTROimport-924
000002767 100__ $$aLobel, A.
000002767 245__ $$aModeling the Asymmetric Wind of Massive LBV Binary MWC 314
000002767 260__ $$c2012
000002767 520__ $$aSpectroscopic monitoring with Mercator-HERMES over the past two years reveals that MWC 314 is a massive binary system composed of an early B-type primary LBV star and a less-luminous supergiant companion. We determine an orbital period Porb of 60.85 d from optical S II and Ne I absorption lines observed in this single-lined spectroscopic binary. We find an orbital eccentricity of e = 0.26, and a large amplitude of the radial velocity curve of 80.6 km s-1. The ASAS V light-curve during our spectroscopic monitoring reveals two brightness minima (ΔV = 0.1 mag) over the orbital period due to partial eclipses at an orbital inclination angle of ˜ 70°. We find a clear correlation between the orbital phases and the detailed shapes of optical and near-IR P Cygni-type line profiles of He I, Si II, and double- or triple-peaked stationary cores of prominent Fe II emission lines. A preliminary 3-D radiative transfer model computed with Wind3D shows that the periodic P Cygni line profile variability results from an asymmetric common-envelope wind with enhanced density (or line opacity) in the vicinity of the LBV primary. The variable orientation of the inner LBV wind region due to the orbital motion produces variable P Cygni line profiles (with wind velocities of ˜ 200 km s-1) between orbital phases φ = 0.65 to 0.85, while weak inverse P Cygni profiles are observed half an orbital period later around φ = 0.15 to 0.35. We do not observe optical or near-IR He II, C III, and Si III lines, signaling that the LBV's spectral type is later than B0. Detailed modeling of the asymmetrical wind properties of massive binary MWC 314 provides important new physical information about the most luminous hot (binary) stars such as η Carinae. 
000002767 700__ $$a Groh, J.
000002767 700__ $$a Torres Dozinel, K.
000002767 700__ $$a Gorlova, N.
000002767 700__ $$a Martayan, C.
000002767 700__ $$a Raskin, G.
000002767 700__ $$a Van Winckel, H.
000002767 700__ $$a Prins, S.
000002767 700__ $$a Pessemier, W.
000002767 700__ $$a Waelkens, C.
000002767 700__ $$a Frémat, Y.
000002767 700__ $$a Hensberge, H.
000002767 700__ $$a Dummortier, L.
000002767 700__ $$a Jorissen, A.
000002767 700__ $$a Van Eck, S.
000002767 700__ $$a Lehmann, H.
000002767 773__ $$c358$$pProceedings of a Scientific Meeting in Honor of Anthony F. J. Moffat$$v465$$y2012
000002767 85642 $$ahttp://esoads.eso.org/abs/2012ASPC..465..358L
000002767 905__ $$apublished in
000002767 980__ $$aNONREF