Observational studies of the symbiotic stars. III High-dispersion IUE and H-alpha observations of EG Andromedae

Details Observational studies of the symbiotic stars. III High-dispersion IUE and H-alpha observations of EG Andromedae Observational studies of the symbiotic stars. III High-dispersion IUE and H-alpha observations of EG Andromedae

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..620o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 620-627.

Astronomy and Astrophysics

Astrophysics

34

H Alpha Line, Iue, Line Spectra, Stellar Spectra, Symbiotic Stars, Ephemeris Time, Giant Stars, Planetary Nebulae

Scientific paper

High-dispersion IUE and optical spectra are presented for the symbiotic star EG Andromedae (HD 4174). Remarkable emission-line strength and profile variations are confirmed for the S IV, O IV, C IV, and He II ultraviolet lines as well as H-alpha. Accurate cross-correlation absorption-line velocities determined from Ti I, Ca I, and Fe I features convincingly demonstrate that EG And is a single-lined spectroscopic binary. The velocity curve suggests that the photometric ephemeris reported by Smith in 1980 should be revised by a redefinition of zero phase by about 0.08 of a period. The primary of the system may be similar to the central star of a planetary nebula embedded in a dense nebula with a mild stellar wind. The behavior of the emission lines is interpreted to indicate that the primary and its surrounding nebula suffer a partial eclipse by the cool giant secondary.

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