TY  - CHAP
A1  - Kusterer, D.-J.
A1  - Nagel, T.
A1  - Werner, K.
A1  - Feldmeier, Achim
T1  - Radiative transfer in CV disk winds
N2  - Mass accretion onto compact objects through accretion disks is a common phenomenon in the universe. It is seen in all energy domains from active galactic nuclei through cataclysmic variables (CVs) to young stellar objects. Because CVs are fairly easy to observe, they provide an ideal opportunity to study accretion disks in great detail and thus help us to understand accretion also in other energy ranges. Mass accretion in these objects is often accompanied by mass outflow from the disks. This accretion disk wind, at least in CVs, is thought to be radiatively driven, similar to O star winds. WOMPAT, a 3-D Monte Carlo radiative transfer code for accretion disk winds of CVs is presented.
Y1  - 2007
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17847
ER  - 
TY  - JOUR
A1  - Fthenakis, Wassilios E.
A1  - Nagel, B.
A1  - Strätz, R.
A1  - Sturzbecher, Dietmar
A1  - Eirich, H.
A1  - Mayr, T.
T1  - Neue Konzepte für Kindertageseinrichtungen : eine empirische Studie zur Situations- und Problemdefinition der beteiligten Interessengruppen
Y1  - 1998
SN  - 3-7841-1106-8
ER  - 
TY  - JOUR
A1  - Kusterer, D. -J.
A1  - Nagel, T.
A1  - Hartmann, S.
A1  - Werner, K.
A1  - Feldmeier, Achim
T1  - Monte Carlo radiation transfer in CV disk winds: application to the AM CVn prototype
JF  - Astronomy and astrophysics : an international weekly journal
N2  - Context. AMCVn systems are ultracompact binaries in which a (semi-) degenerate star transfers helium-dominated matter onto a white dwarf. They are effective gravitational-wave emitters and potential progenitors of Type Ia supernovae.
 Aims. To understand the evolution of AMCVn systems it is necessary to determine their mass-loss rate through their radiation-driven accretion-disk wind. We constructed models to perform quantitative spectroscopy of P Cygni line profiles that were detected in UV spectra.
 Methods. We performed 2.5D Monte Carlo radiative transfer calculations in hydrodynamic wind structures by making use of realistic NLTE spectra from the accretion disk and by accounting for the white dwarf as an additional photon source.
 Results. We present first results from calculations in which LTE opacities are used in the wind model. A comparison with UV spectroscopy of the AMCVn prototype shows that the modeling procedure is potentially a good tool for determining mass-loss rates and abundances of trace metals in the helium-rich wind.
KW  - radiative transfer
KW  - stars: winds, outflows
KW  - stars: individual: AM CVn
KW  - accretion, accretion disks
Y1  - 2014
U6  - https://doi.org/10.1051/0004-6361/201321438
SN  - 0004-6361
SN  - 1432-0746
VL  - 561
PB  - EDP Sciences
CY  - Les Ulis
ER  -