Other
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..831s&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 831-839.
Other
24
Binary Stars, Spectrum Analysis, Stellar Models, Stellar Spectrophotometry, Variable Stars, Electron Density (Concentration), Gamma Rays, H Alpha Line, Line Spectra, Periodic Variations, Radial Velocity, Semiregular Variable Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Temperature, Stellar Winds
Scientific paper
The paper discusses spectroscopic observations, covering the double gamma 5800-6700 region, of the symbiotic star HD 4174. Changes in the equivalent width, radial velocity, and line profile of H(alpha) were observed, and were found to be correlated with a derived pulsation period of 470 days. The data were most consistent with a binary model consisting of an M2 III semiregular variable and a hot secondary surrounded by a common envelope with a temperature of about 10,000 K and an electron density in the range of 0.4 to 3 x 10 to the 5th/cu cm. The circumstellar envelope was found to arise from a mass loss at a rate of about 3 x 10 to the -7th solar mass/yr, driven by isothermal pulsations from the M2 III primary. A weak blue-shifted component of the H(alpha) emission was explained in terms of a stellar wind from the hot component at about 150 km/sec.
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