22 citations · 22 across the 4 of their papers we have counts for
8 papers · 1 filter
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
New Light Curves and Spectra of the close PG1159 Binary System SDSSJ212531.92-010745.9
Sonja Schuh, Thorsten Nagel, Iris Traulsen +1
Methods to measure masses of PG1159 stars in order to test evolutionary scenarios are currently based on spectroscopic masses or asteroseismological mass determinations. SDSSJ21253…
Limits on iron-dominated fallback disk in SN 1987A
K. Werner, T. Nagel, T. Rauch
The non-detection of a point source in SN1987A imposes an upper limit for the optical luminosity of L=2L_sun. This limits the size of a possible fallback disk around the stellar re…
Non-LTE Models for Neutron Star Atmospheres and Supernova-Fallback Disks
K. Werner, T. Nagel, T. Rauch +1
We describe our recent progress in modeling supernova-fallback disks and neutron star (NS) atmospheres. We present a first detailed spectrum synthesis calculation of a SN-fallback…
On Possible Oxygen/Neon White Dwarfs: H1504+65 and the White Dwarf Donors in Ultracompact X-ray Binaries
K. Werner, N. J. Hammer, T. Nagel +2
We discuss the possibility to detect O/Ne white dwarfs by evidence for Ne overabundances. The hottest known WD, H1504+65, could be the only single WD for which we might be able to…
Modeling of Oxygen-Neon Dominated Accretion Disks in Ultracompact X-ray Binaries: 4U1626-67
K. Werner, T. Nagel, S. Dreizler +1
We report on first results of computing synthetic spectra from H/He-poor accretion disks in ultracompact LMXBs. We aim at the determination of the chemical composition of the very…