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Long-term spectroscopic monitoring of Alpha OrionisUltraviolet spectroscopy (IUE) and optical photometry of Alpha Orionis (M2 Iab) were obtained at 2 wk intervals from January 1984 through April 1986. The ultraviolet (2950 to 3050 A) and optical continua are found to vary in phase with each other. The Mg II h and k total emission flux is similarly modulated, but lags the optical light curve by 0.25 yr. However, the h and k line fluxes vary by different amounts and in a manner which suggests a periodicity of 1 yr. These and other spectral variations may be causally linked to atmospheric disturbances, possibly related to a close stellar companion.
Document ID
19870009768
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sonneborn, G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hartmann, L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hartmann, L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hartmann, L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hartmann, L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hartmann, L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1986
Publication Information
Publication: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE
Subject Category
Astronomy
Accession Number
87N19201
Distribution Limits
Public
Copyright
Other

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