2 citations · 2 across the 3 of their papers we have counts for
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Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. IV. The color-magnitude relation
Thorsten Lisker, Eva K. Grebel, Bruno Binggeli
We present an analysis of the optical colors of 413 Virgo cluster early-type dwarf galaxies (dEs), based on Sloan Digital Sky Survey imaging data. Our study comprises (1) a compari…
Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. III. Subpopulations: distributions, shapes, origins
Thorsten Lisker, Eva K. Grebel, Bruno Binggeli +1
From a quantitative analysis of 413 Virgo cluster early-type dwarf galaxies (dEs) with Sloan Digital Sky Survey imaging data, we find that the dE class can be divided into multiple…
GOODS, UDF, and the evolution of early-type galaxies
I. Ferreras, T. Lisker, A. Pasquali +3
The HST/ACS images of GOODS-South have been used to select a sample of early-type galaxies, based on morphology and on the Kormendy relation. The classification scheme does not use…
Subluminous O stars from the ESO Supernova Progenitor Survey - Observation versus Theory
A. Stroeer, U. Heber, T. Lisker +2
The ESO Supernova Progenitor Survey (SPY) has identified 58 (mostly helium-rich) subluminous O stars. We use the Balmer line strength to distinguish sdO from He-sdO (no Balmer line…
Double degenerates from the supernova Ia progenitor survey (SPY)
C. Karl, R. Napiwotzki, U. Heber +4
We report on follow-up observations of double degenerate (DD) white dwarfs from the Supernovae Ia Progenitor Survey (SPY). Orbital parameters of four systems, including a massive s…