Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..275w&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, June 1980, p. 275-283.
Astronomy and Astrophysics
Astronomy
73
Late Stars, Nebulae, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, Balmer Series, Binary Stars, Interstellar Extinction, Line Spectra, Silicon Oxides
Scientific paper
Multichannel spectrophotometric and SIT spectrograph data are reported for the symbiotic star R Agr, and the physical parameters that describe the emission nebulosity are established. The reddening is 0.67 in (B-V), an electron temperature near 11,000 K is derived, and an electron density between 300,000 and 5,000,000 is found on the star position. A small enhancement of helium and a substantial enhancement of nitrogen are observed; the ratios of Ne III and S III to O III are nearly normal. Attention is also given to physical dimensions for the system, and the expansion velocity is estimated at about 30 km/s. In addition, it is argued that R Aqr may be a single star with a magnetically active region.
Greenstein Jesse Leonard
Wallerstein George
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