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New Light on UU Sagittae

Published online by Cambridge University Press:  07 August 2017

S.A. Bell
Affiliation:
Department of Physics and Astronomy, North Haugh, St. Andrews, Fife KY16 9SS, Scotland
D.L. Pollacco
Affiliation:
Department of Physics and Astronomy, North Haugh, St. Andrews, Fife KY16 9SS, Scotland

Extract

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New V and I band CCD photometry and medium resolution spectroscopy are used to derive the masses, luminosities and radii accurate to < 10% for the individual components of the eclipsing central star of the planetary nebula A63–UU Sge (M1 = 0.63 ± 0.06M, R1 = 0.33 ± 0.01R, M2 = 0.29 ± 0.04M and R2 = 0.53 ± 0.002R). Emission lines from the secondary component and HeII and NV absorption features from the primary component are used to determine the first radial velocity curves of the system. Ultra–violet and optical spectra show that the temperature of the primary compoment is ∼ 105K – much larger than previously suspected. As the techniques used are essentially independent this is probably the most accurately known mass for a planetary nebula central star and therefore allows meaningful comparison to be made with evolutionary tracks for these objects.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Copyright
Copyright © Kluwer 1993