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18 papers · 2 filters
A Possible Origin of the Mass-Metallicity Relation of Galaxies
J. Koeppen, C. Weidner, P. Kroupa
Observations show that galaxies follow a mass-metallicity relation over a wide range of masses. One currently favoured explanation is that less massive galaxies are less able to re…
Towards a pure ZZ Ceti instability strip
B. G. Castanheira, S. O. Kepler, A. F. M. Costa +8
We have observed again two stars inside the ZZ Ceti instability strip that were previously classified as not-observed-to-vary (NOV) by Mukadam et al. (2004) and found them to be lo…
Chemical compositions and plasma parameters of planetary nebulae with Wolf-Rayet and wels type central stars
P. Girard, J. Koppen, A. Acker
Aims: Chemical compositions and other properties of planetary nebulae around central stars of spectral types [WC], [WO], and wels are compared with those of `normal' central stars,…
The Lowest Mass White Dwarf
Mukremin Kilic, Carlos Allende Prieto, Warren R. Brown +1
Extremely low mass white dwarfs are very rare objects likely formed in compact binary systems. We present MMT optical spectroscopy of 42 low mass white dwarf candidates serendipito…
Black hole accretion: theoretical limits and observational implications
D. Heinzeller, W. J. Duschl, S. Mineshige +1
Recently, the issue of the role of the Eddington limit in accretion discs became a matter of debate. While the classical (spherical) Eddington limit is certainly an over-simplifica…
Gemini spectra of 12000K white dwarf stars
S. O. Kepler, B. G. Castanheira, A. F. M. Costa +1
We report signal-to-noise ratio SNR ~ 100 optical spectra for four DA white dwarf stars acquired with the GMOS spectrograph of the 8m Gemini north telescope. These stars have 18<g<…