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Discrete absorption components in the massive LBV Binary MWC 314

Published online by Cambridge University Press:  23 January 2015

A. Lobel
Affiliation:
Royal Observatory of Belgium, Brussels email: Alex.Lobel@oma.be, alobel@sdf.org
C. Martayan
Affiliation:
European Southern Observatory, Chile
M. Corcoran
Affiliation:
Goddard Space Flight Center, Greenbelt MD, USA
J. H. Groh
Affiliation:
Geneva Observatory, Versoix, Switzerland
Y. Frémat
Affiliation:
Royal Observatory of Belgium, Brussels email: Alex.Lobel@oma.be, alobel@sdf.org
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Abstract

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We investigate the physical properties of large-scale wind structures around massive hot stars with radiatively-driven winds. We observe Discrete Absorption Components (DACs) in optical He i P Cygni lines of the LBV binary MWC 314 (Porb = 60.8 d). The DACs are observed during orbital phases when the primary is in front of the secondary star. They appear at wind velocities between −100 km s−1 and −600 km s−1 in the P Cyg profiles of Hei λ5875, λ6678, and λ4471, signaling high-temperature expanding wind regions of enhanced density and variable outflow velocity. The DACs can result from wave propagation linked to the orbital motion near the low-velocity wind base. The He i lines indicate DAC formation close to the primary's surface in high-temperature wind regions in front of its orbit, or in dynamical wind regions confined between the binary stars. We observed the DACs with Mercator-HERMES on 5 Sep 2009, 5 May 2012, and 6 May 2014 when the primary is in front of the secondary star. XMM-Newton observations of 6 May 2014 significantly detected MWC 314 in X-rays at an average rate of ~0.015 cts s−1.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Lobel, A., Groh, J. H., Martayan, C., et al. 2013, A&A 559, A16Google Scholar
Marston, A. P. & McCollum, B. 2008, A&A 477, 193Google Scholar
Miroshnichenko, A. S., Frémat, Y., Houziaux, L., et al. 1998, A&AS 131, 469Google Scholar
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