On the binary model for CH Cygni

Details On the binary model for CH Cygni On the binary model for CH Cygni

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..860l&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Nov. 1984, p. 860-867) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Nov.-Dec

Astronomy and Astrophysics

Astronomy

7

Binary Stars, Stellar Evolution, Stellar Mass, Stellar Models, Variable Stars, Hertzsprung-Russell Diagram, Radial Velocity, Spectral Energy Distribution

Scientific paper

The variable star CH Cyg is characterized on the basis of published photometric and spectroscopic observations. The data are presented in tables ang graphs, and CH Cyg is identified as a binary system comprising a gM6 star with mass = 2.7 solar mass, log (luminosity/solar luminosity) = 3.84, Teff = 2850 + or - 120 K, theta = 9.8 + or - 1.5 marsec, and R = 340 + or 35 solar radius and a hot C-O dwarf of mass 1.4 solar mass, radius 0.003 solar radius, and envelope pseudophotosphere radius 4 solar radius. It is pointed out that the phase dependence of radial-velocity estimates based on the forbidden lines of O I precludes their use as indicators of center-of-mass velocity.

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