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Modelling the asymmetric wind of the luminous blue variable binary MWC 314 | | A. Lobel
; J. H. Groh
; C. Martayan
; Y. Frémat
; K. Torres Dozinel
; G. Raskin
; H. Van Winckel
; S. Prins
; W. Pessemier
; C. Waelkens
; H. Hensberge
; L. Dummortier
; A. Jorissen
; S. Van Eck
; H. Lehmann
; | | Date: |
21 Aug 2013 | | Abstract: | We present a spectroscopic analysis of MWC 314, a luminous blue variable
(LBV) candidate with an extended bipolar nebula. The detailed spectroscopic
variability is investigated to determine if MWC 314 is a massive binary system
with a supersonically accelerating wind or a low-mass B[e] star. We compare the
spectrum and spectral energy distribution to other LBVs (such as P Cyg) and
find very similar physical wind properties, indicating strong kinship. We
combined long-term high-resolution optical spectroscopic monitoring and V-band
photometric observations to determine the orbital elements and stellar
parameters and to investigate the spectral variability with the orbital phases.
We developed an advanced model of the large-scale wind-velocity and
wind-density structure with 3-D radiative transfer calculations that fit the
orbitally modulated P Cyg profile of He I lam5876, showing outflow velocities
above 1000 km/s. We find that MWC 314 is a massive semi-detached binary system
of ~1.22 AU, observed at an inclination angle of i=72.8 deg. with an orbital
period of 60.8 d and e=0.23. The primary star is a low-vsini LBV candidate of
m1=39.6 Msun and R1=86.8 Rsun. The detailed radiative transfer fits show that
the geometry of wind density is asymmetric around the primary star with
increased wind density by a factor of 3.3, which leads the orbit of the
primary. The variable orientation causes the orbital modulation that is
observed in absorption portions of P Cyg wind lines. Wind accretion in the
system produces a circumbinary disc. MWC 314 is in a crucial evolutionary phase
of close binary systems, when the massive primary star has its H envelope being
stripped and is losing mass to a circumbinary disc. MWC 314 is a key system for
studying the evolutionary consequences of these effects. | | Source: | arXiv, 1308.4638 | | Services: | Forum | Review | PDF | Favorites | |
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