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Browsing by Author "Lisker, T."
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Close binary EHB stars from SPY
Napiwotzki, R.; Karl, C.; Lisker, T.; Heber, U.; Christlieb, N.; Reimers, D.; Nelemans, G.; Homeier, D. (2004-06) -
Discovery of a helium-core white dwarf progenitor
Heber, U.; Edelmann, H.; Lisker, T.; Napiwotzki, R. (2003-12) -
The ESO supernovae type Ia progenitor survey (SPY) : The radial velocities of 644 DA white dwarfs
Napiwotzki, R.; Karl, C. A.; Lisker, T.; Catalan, S.; Drechsel, H.; Heber, U.; Homeier, D.; Koester, D.; Leibundgut, B.; Marsh, T. R.; Moehler, S.; Nelemans, G.; Reimers, D.; Renzini, A.; Stroer, A.; Yungelson, L. (2019-07-27)Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We report results of a large radial velocity survey ... -
Exploring the formation of spheroidal galaxies out to z ∼ 1.5 in GOODS
Ferreras, I.; Lisker, T.; Pasquali, A.; Kaviraj, S. (2009-05-01)The formation of massive spheroidal galaxies is studied on a visually classified sample extracted from the Advanced Camera for Surveys/Hubble Space Telescope (ACS/HST) images of the Great Observatories Origins Deep Survey ... -
The first generation of Virgo cluster dwarf elliptical galaxies?
Lisker, T.; Janz, J.; Hensler, G.; Kim, S.; Rey, S.C.; Weinmann, S.; Mastropietro, C.; Hielscher, O.; Paudel, S.; Kotulla, R. (2009)In the light of the question whether most early-type dwarf (dE) galaxies in clusters formed through infall and transformation of late-type progenitors, we search for an imprint of such an infall history in the oldest, most ... -
High resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey III. DA white dwarfs
Koester, D.; Voss, B.; Napiwotzki, R.; Christlieb, N.; Homeier, D.; Lisker, T.; Reimers, D.; Heber, U. (2009-10)Context. The ESO Supernova Ia Progenitor Survey (SPY) took high-resolution spectra of more than 1000 white dwarfs and pre-white dwarfs. About two thirds of the stars observed are hydrogen-dominated DA white dwarfs. Here ... -
Hot subdwarfs from the ESO Supernova Ia Progenitor Survey. I. Atmospheric parameters and cool companions of sdB stars
Lisker, T.; Heber, U.; Napiwotzki, R.; Christlieb, N.; Han, Z.; Homeier, D.; Reimers, D. (2005-01) -
On the formation of massive galaxies : A simultaneous study of number density, size and intrinsic colour evolution in GOODS
Ferreras, I.; Lisker, T.; Pasquali, A.; Khochfar, S.; Kaviraj, S. (2009-07-01)The evolution of number density, size and intrinsic colour is determined for a volume-limited sample of visually classified early-type galaxies selected from the Hubble Space Telescope/Advanced Camera for Surveys images ... -
Spectroscopic analysis of sdB stars from the ESO Supernova Ia Progenitor Survey
Lisker, T.; Heber, U.; Napiwotzki, R.; Christlieb, N.; Han, Z.; Homeier, D.; Reimers, D. (2004) -
Subdwarf B Stars from the ESO Supernova Ia Progenitor Survey -- Observation versus Theory
Lisker, T.; Heber, U.; Napiwotzki, R.; Christlieb, N.; Han, Z.; Homeier, D.; Reimers, D. (Astronomical Society of the Pacific, 2005)We present the analysis of a high-quality sample of optical spectra for 76 sdB stars from the ESO Supernova Ia Progenitor Survey. Effective temperature, surface gravity, and photospheric helium abundance were derived from ... -
Subluminous O Stars from the ESO Supernova Progenitor Survey - Observation versus Theory
Stroeer, A.; Heber, U.; Lisker, T.; Napiwotzki, R.; Dreizler, S. (Astronomical Society of the Pacific, 2005)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 lines) and present the results of the analyses ...