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Photometry, polarimetry, spectroscopy, and spectropolarimetry of the enigmatic Wolf-Rayet star EZ Canis MajorisNew observations of the peculiar Wolf-Rayet star EZ Canis Majoris collected since 1987 are presented, and photometric, polarimetric, spectroscopic, and spectropolarimetric data are discussed. Linear polarization data are well fitted with an eccentric binary model where an additional free parameter is included to allow for epoch-dependent changes of the geometrical electron distribution in the W-R envelope. This yields a set of basic parameters, including an eccentricity e = 0.39 +/- 0.02 and an orbital inclination i = 114 deg +/- 3 deg. The spectroscopic data show global profile variations for all three observed strong emission lines He II 5412 A, C IV 5807 A, and He I 5876 A. Radial velocities of the lines vary with the 3.766-day period. Radially expanding inhomogeneities are superposed on the line profiles and variable polarization in the lines is observed.
Document ID
19930026457
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Robert, Carmelle
(Space Telescope Science Inst. Baltimore, MD, United States)
Moffat, Anthony F. J.
(Montreal Univ.; Observatoire du Mont Megantic, Canada)
Drissen, Laurent
(Space Telescope Science Inst. Baltimore, MD, United States)
Lamontagne, Robert
(Montreal Univ.; Observatoire du Mont Megantic, Canada)
Seggewiss, Wilhelm
(Observatorium Hoher List Daun, Germany)
Niemela, Virpi S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cerruti, Miguel A.
(Inst. de Astronomia y Fisica del Espacio Buenos Aires, Argentina)
Barrett, Paul
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bailey, Jeremy
(United Kingdom Infrared Telescope Hilo, HI, United States)
Garcia, Jorge
(Univ. of Toronto Southern Observatory Las Campanas, Chile)
Date Acquired
August 15, 2013
Publication Date
September 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 397
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A10454
Funding Number(s)
CONTRACT_GRANT: NSF INT-82-13103
Distribution Limits
Public
Copyright
Other

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