Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441104r&link_type=abstract
American Astronomical Society, AAS Meeting #214, #411.04; Bulletin of the American Astronomical Society, Vol. 41, p.676
Astronomy and Astrophysics
Astronomy
Scientific paper
While stellar evolution is generally well understood, many binaries present masses, orbits, and pairings that defy explanation. For example, low mass donor stars in cataclysmic variable mass transfer systems can show evidence for CNO processing even though they are, at present, a factor of two or more too low in mass to have turned on the CNO cycle. Observations of post-Algol binaries are wrought with uncertainty as low gravity shells surrounding the stars can masquerade as atmospheres presenting an incorrect spectral type and luminosity class. Masses of the component stars in the post-Algols are often not known to within factors of two. SIM can measure the reflex motion of a binary and help us to disentangle the true orbit. With SIM observations, and supporting spectroscopy and ground-based O/IR imaging interferometry, the astrometric signatures of post-Algols including gas streams, orbital inclinations and shells can be explored. For numerous bright systems, the semi-major axis motions will have values typically of >100 μarcsec.
Howell Steve B.
Ridgway Stephen T.
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