Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984comap..10...85m&link_type=abstract
Comments on Modern Physics, Part C - Comments on Astrophysics (ISSN 0146-2970), vol. 10, June 1984, p. 85-96.
Astronomy and Astrophysics
Astronomy
4
M Stars, Peculiar Stars, Stellar Mass Ejection, Variable Stars, Hertzsprung-Russell Diagram, Iue, Line Spectra, Mira Variables, Radio Astronomy, Subdwarf Stars, Ultraviolet Spectra, Ultraviolet Spectroscopy
Scientific paper
It is pointed out that the composite emission object R Aquarii embodies a number of characteristic properties which distinguish it from other peculiar emission stars. The visual spectrum indicates the presence of a cool Mira variable in close association with a hot unresolved ionizing source of radiation which appears to be responsible for the high excitation nebular emission observed. It has been suggested by Hubble (1943) and Baade (1944) that the distinguishing meniscus-shaped nebula was formed by a nova outburst which occurred about 600 years ago. Wallerstein and Greenstein (1980) reported the appearance of a new feature in R Aquarii which resembles a brilliant 'spike' or 'jet' protruding a distance approximately 7 arcsec from the central compact region. Attention is given to several models which have been considered to explain the emission feature.
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