IUE observations of the symbiotic star CH Cygni during an active phase

Details IUE observations of the symbiotic star CH Cygni during an active phase IUE observations of the symbiotic star CH Cygni during an active phase

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..305h&link_type=abstract

Nature, vol. 279, May 24, 1979, p. 305-307. Research supported by the Consiglio Nazionale delle Ricerche.

Computer Science

8

Binary Stars, Iue, M Stars, Subdwarf Stars, Ultraviolet Spectra, Absorption Spectra, Balmer Series, Giant Stars, H Lines, K Lines

Scientific paper

Observations of CH Cygni were made to determine whether this symbiotic star is a binary system composed of an M6 giant and a hot subdwarf or whether it is a cool star surrounded by a thick corona. The UV spectrum was observed with IUE in the low-resolution mode and short-wave range during the active phase of the star. The UV spectrum was characterized by an almost flat continuum from 1250 to 1700 A, a strong emission at 1302 A due to O I, and by several fainter emissions; several absorption lines are present. The flux observed in one period was four times that observed three months earlier. The observations do not permit a decision between the two hypotheses stated above. Observations during a quiescent period are needed.

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