Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..666k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, May 1983, p. 666-673.
Astronomy and Astrophysics
Astronomy
92
Binary Stars, Infrared Spectroscopy, M Stars, Stellar Spectra, Absorption Spectra, Carbon Monoxide, Giant Stars, Late Stars, Roche Limit, Stellar Color, Stellar Luminosity
Scientific paper
Low-resolution 2-4 micron spectroscopy of a small sample of symbiotic stars is presented, in an effort to determine if the giant components of these systems fill their Roche Lobes. A (2.35)-(2.2) color index measures the strength of the CO absorption band and provides a useful discriminant of luminosity class among single M-type giants which separates normal giants from supergiants at the same spectral type. Although interpretation of symbiotic spectra is complicated somewhat by their binary nature, the results suggest the late-type components in these systems range from normal red giants to bright asymptotic giants. The possible presence of non-Roche Lobe filling, low-luminosity giants in some symbiotic stars cannot be understood within the framework of existing theories for these interesting objects, and thus may provide important information for understanding mass transfer in binary systems.
Gallagher Jay S.
Kenyon Scott. J.
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