EG Andromedae: A New Orbit and Additional Evidence for a Photoionized Wind
arXiv:1604.04635 · doi:10.3847/0004-6256/152/1/1
Abstract
We analyze a roughly 20 yr set of spectroscopic observations for the symbiotic binary EG And. Radial velocities derived from echelle spectra are best-fit with a circular orbit having orbital period P = 483.3 +- 1.6 days and semi-amplitude K = 7.34 +- 0.07 km/sec. Combined with previous data, these observations rule out an elliptical orbit at the 10-sigma level. Equivalent widths of H~I Balmer emission lines and various absorption features vary in phase with the orbital period. Relative to the radius of the red giant primary, the apparent size of the H II region is consistent with a model where a hot secondary star with effective temperature of roughly 75,000 K ionizes the wind from the red giant.
16 pages of text, 2 tables. 6 figure, Astronomical Journal, accepted
References in corpus (7)
- New evolutionary sequences for extremely low mass white dwarfs: Homogeneous mass and age determinations, and asteroseismic prospects
- Comparison of theoretical white dwarf cooling timescales
- IPHAS and the symbiotic stars. I. Selection method and first discoveries
- Numerical Simulations of Wind Accretion in Symbiotic Binaries
- Recent photometry of symbiotic stars - XII
- Wind mass transfer in S-type symbiotic binaries II. Indication of wind focusing
- A Digital Low Dispersion Spectral Library Covering the 3500-7500AA Region Using the SAAO Radcliffe 1.9m Telescope's Cassegrain Spectrograph
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- Chemical abundance analysis of symbiotic giants. Metallicity and CNO abundance patterns in 14 northern S-type systems
- Center for Astrophysics Optical Infrared Science Archive. I. FAST Spectrograph
- FUSE Spectroscopy of the Accreting Hot Components in Symbiotic Variables
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