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the 1984 eclipse of the symbiotic binary sy muscaeData from IUE spectra obtained with the 10 x 20-arcsec aperture on May 13, 1984, and optical spectrophotometry obtained with an SIT vidicon on the 1.5-m telescope at CTIO on April 29-May 1, 1984, are reported for the symbiotic binary SY Mus. The data are found to be consistent with a model of a red-giant secondary of 60 solar radii which completely eclipses the hot primary every 627 d but only partially eclipses the 75-solar-radius He(+) region surrounding the primary. The distance to SY Mus is estimated as 1.3 kpc. It is suggested that the large Balmer decrement in eclipse, with (H-alpha)/(H-beta) = 8.3 and (H-beta)/(H-gamma) = 1.5, is associated with an electron density of about 10 to the 10th/cu cm.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Kenyon, S. J.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Michalitisianos, A. G.
(NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, MD, United States)
Lutz, J. H.
(Washington State University Pullman, WA; Observatorio Interamericano de Cerro Tololo, La Serena, Chile)
Kafatos, M.
(George Mason University Fairfax, VA, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1985
Publication Information
Publication: Astronomical Society of the Pacific, Publications
Volume: 97
ISSN: 0004-6280
Subject Category
Distribution Limits