Discrete absorption components in the massive LBV Binary MWC 314
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 and -600 km/s in the P Cyg profiles of He I lam5875, lam6678, and lam4471, 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.
Cite
@article{arxiv.1410.0889,
title = {Discrete absorption components in the massive LBV Binary MWC 314},
author = {A. Lobel and C. Martayan and M. Corcoran and J. H. Groh and Y. Frémat},
journal= {arXiv preprint arXiv:1410.0889},
year = {2016}
}
Comments
2 pages, 2 figures, to appear in IAUS 307, 2014, Proc. of New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry, Geneva, Switzerland, June 23-27, 2014