80 citations · 152 across the 6 of their papers we have counts for
6 papers
Optical Spectra of Ultracool Dwarfs with the Southern African Large Telescope
C. Koen, B. Miszalski, P. Väisänen +1
New spectra of 81 ultracool dwarfs (spectral types M7 and later) are discussed. Spectral classifications of 49 objects are available in the literature, while 32 objects are newly c…
Two candidate brown dwarf companions around core helium-burning stars
V. Schaffenroth, L. Classen, K. Nagel +4
Hot subdwarf stars of spectral type B (sdBs) are evolved, core helium-burning objects. The formation of those objects is puzzling, because the progenitor star has to lose almost it…
Low-mass stellar and substellar companions to sdB stars
S. Geier, L. Classen, P. Bruenner +9
It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an…
The Detailed Forms of the LMC Cepheid PL and PLC Relations
C. Koen, S. Kanbur, C. Ngeow
Possible deviations from linearity of the LMC Cepheid PL and PLC relations are investigated. Two datasets are studied, respectively from the OGLE and MACHO projects. A nonparametri…
The DA+dMe eclipsing binary EC13471-1258: its cup runneth over...just
D. O'Donoghue, C. Koen, D. Kilkenny +5
EC13471-1258 is a detached eclipsing binary with Porb = 3h37m, comprising a DA white dwarf and a dMe dwarf. Total eclipses of the white dwarf lasting 14 min, and a large amplitude…
Metallicity estimates for A-, F-, and G-type stars from the Edinburgh-Cape blue object survey
T. C. Beers, S. Rossi, D. O'Donoghue +4
The Edinburgh-Cape Blue Object Survey is an ongoing project to identify and analyse a large sample of hot stars selected initially on the basis of photographic colours (down to a m…