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Title:
On the System Parameters of the Dwarf Nova EM Cygni
Authors:
Welsh, W. F.; Froning, C. S.; Marsh, T. R.; Reimer, T. W.; Robinson, E. L.; Wood, P. R.
Publication:
The Seventh Pacific Rim Conference on Stellar Astrophysics, ASP Conference Series, Vol. 362, Proceedings of the conference held 1-5 November, 2005 in Sejong University, Seoul, Korea. Edited by Y.W. Kang, H.-W. Lee, K.-C. Leung, and K.-S. Cheng. San Francisco: Astronomical Society of the Pacific, 2007., p.241
Publication Date:
06/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..362..241W

Abstract

EM Cyg is a bright, eclipsing, double-lined spectroscopic binary and therefore potentially a very important cataclysmic variable because in principle a full set of accurate system parameters can be determined for it. However, measuring the system parameters has turned out to be difficult due to the contaminating effects of a third star along the line of sight. In this work we use FUSE spectroscopy to infer the orbital motion of the white dwarf star. We use the cross correlation method to measure the radial velocities and pay particular attention to subtle systematic effects that can bias the derived orbital velocity. With our new value of orbital velocity we re-derive the binary system parameters using a Monte Carlo method that handles non-Gaussian constraints. The resulting system parameters are more reliable than previous estimates and will facilitate future work on EM Cyg and its accretion disk.
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