Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..939p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 15, 1985, p. 939-954.
Astronomy and Astrophysics
Astronomy
46
Giant Stars, M Stars, Novae, Stellar Spectra, Symbiotic Stars, Ultraviolet Astronomy, Absorption Spectra, Active Galaxies, Interstellar Gas, Line Spectra, Nebulae, Stellar Mass Ejection
Scientific paper
AG Peg has displayed the slowest known nova outburst. Since the system contains an M giant, it can be classified as symbiotic star. Presented are ultraviolet spectra of AG Peg taken with the IUE satellite. A variety of regimes having characteristically different spectral features is found. These include a high-velocity wind in which high-ionization P Cygni lines are seen and a nebular emission zone of lower velocity but very high electron density. These data are interpreted in terms of a thermonuclear event on the surface of a white dwarf which has gradually accreted hydrogen-rich gas from the wind of the M giant. The high-velocity wind is a manifestation of mass loss from this star. The ionization of the hot component extends close to the surface of the M giant, and there gives rise to the lower-velocity emission. A tail of this emission forms behind the M star by ablation in the intense ultraviolet radiation and hot wind of the companion. This tail gives the illusion of a stream of gas flowing from the hot star to the cool. This ablation from the M giant is paralleled with the similar situation thought to exist in quasars and active galaxies.
Allen David A.
Penston Michael V.
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