Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343410h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #434.10; Bulletin of the American Astronomical Society, Vol. 41, p.304
Other
Scientific paper
High-dispersion near-infrared spectroscopic observations are used to derive orbital elements for the symbiotic binary CH Cyg. The current radial velocities, added to our previously published velocities for the M giant in the CH Cyg symbiotic system, result in a time series of 29 years. The two previously identified velocity periods are confirmed. The long period, 15.6 ± 0.1 years, is shown to result from a binary orbit with a 0.7 solar mass white dwarf and 2 solar mass M giant. Mass transfer to the white dwarf is responsible for the symbiotic classification. CH Cyg is the longest period S-type symbiotic known. The short period is 750 ± 1 days. This period is on Wood's pulsation sequence D for AGB stars. This sequence contains stars identified as having long secondary periods (LSP). The cause of the LSP variation in CH Cyg and other stars is unknown. We argue that LSP results from g-mode non-radial pulsation. If g-mode pulsation does cause LSPs, current stellar structure calculations for pulsating AGB stars must be modified.
Fekel Francis C.
Hinkle Kenneth H.
Joyce Richard R.
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