Evolution of the optical spectrum of HM sagittae: 1977--1982
High-resolution spectra have been obtained for HM Sge an V1016 Cygni, two prominent members of the RR Tel family of symbiotic stars. Gaussian fits were made to the emission lines present in those spectra in order to attempt a kinematic separation of the different line-emitting regions expected in those stars. The dominant components of the emission lines for both stars are broad and double-peaked, with peak separations of about 70 km s/sup -1/ and gaussian widths of about 30 km s/sup -1/. Those components are attributed to an expanding, biconical shell created by the interaction of a high-velocity wind from the white dwarf with a preexisting, low velocity wind from the cool star. Narrow, double-peaked components are also present for the forbidden lines of low critical density in HM Sge. Those components presumably originate in the remnant red giant wind external to the shell. The narrow iron lines observed in V1016 Cyg must originate in a high density region, with the best candidate being the atmosphere of the cool star. Evidence for high-velocity gas near the white dwarf, probably in the form of an accretion disk, derives from the great width, FWHM = 490 km s/sup -1/, of the profile for the ''6830'' feature in V1016 Cyg.
- Research Organization:
- Harvard-Smithsonian Center for Astrophysics
- OSTI ID:
- 6196896
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 280:2; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
ATMOSPHERES
BALMER LINES
BINARY STARS
CHARGED PARTICLES
COSMIC GASES
DATA
DWARF STARS
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
FLUIDS
FLUX DENSITY
FORBIDDEN TRANSITIONS
GASES
GIANT STARS
HELIUM IONS
INFORMATION
IONS
IRON
LINE WIDTHS
METALS
NEBULAE
NUMERICAL DATA
RED GIANT STARS
SPECTRA
STAR ACCRETION
STAR EVOLUTION
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR FLARES
STELLAR WINDS
SYMBIOTIC STARS
TEMPERATURE MEASUREMENT
TRANSITION ELEMENTS
VELOCITY
WHITE DWARF STARS