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The UV-excess survey of the northern galactic plane
(2009)
The UV-Excess survey of the northern Galactic plane images a 10°× 185° wide band, centred on the Galactic equator using the 2.5-m Isaac Newton Telescope in four bands ( U, g, r, He i 5875) down to ∼21–22 mag ( ~20 in He i ...
Central stars of planetary nebulae in SDSS and IPHAS
(2009)
Space densities and birthrates of Planetary Nebulae (PNe) are highly uncertain. A large range of formation rates has been derived by different studies, which has led to contradicting ideas for the final evolutionary phases ...
The age of white dwarf companions
(2009)
We carried out a spectroscopic investigation of single lined white dwarfs (WDs) in double degenerate (DD) systems and discuss their binary evolution. Simulated spectra of the Hα region are used to derive upper limits on ...