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IUE observations of a luminous M supergiant that exhibits intense continuum in the far ultravioletObservations of the late type M supergiant TV Gem (M1Iab) reveal strong UV continuum between 1200 A and 3200 A. The continuum is essentially featureless with the exception of a number of broad absorption features in the short wavelength spectra range. An absorption feature centered around 1400 A could be due to Si IV absorption found typically in spectra of middle B type stars. UV emission from this star is unexpected because earlier ground-based observations give no indication of a possible association with an early companion or circumstellar ionized nebulosity. A B9 or A1 III - IV type star approximately 2to 3 magnitudes fainter than the M star could explain the level of UV continuum observed, but a fully self consistent explanation that includes the B-V color index of TV Gem is not as yet possible. The continuum flux dependence with wavelength in the UV spectral range could be attributed to a high energy source such as an accretion disc. It is suggested TV Gem is a good candidate for HEAO-2 (Einstein) satellite observations because a high energy object in close proximity to the M star would likely be a source of soft X-ray emission.
Document ID
19800019772
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Michalitsianos, A. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kafatos, M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hobbs, R. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1980
Subject Category
Astronomy
Report/Patent Number
NASA-TM-80681
Accession Number
80N28273
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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