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Discrete absorption components in the massive LBV Binary MWC 314

  • A. Lobel (a1), C. Martayan (a2), M. Corcoran (a3), J. H. Groh (a4) and Y. Frémat (a1)...

Abstract

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.

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References

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Lobel, A., Groh, J. H., Martayan, C., et al. 2013, A&A 559, A16
Marston, A. P. & McCollum, B. 2008, A&A 477, 193
Miroshnichenko, A. S., Frémat, Y., Houziaux, L., et al. 1998, A&AS 131, 469
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