Volume 417, Number 3, April III 2004
|Page(s)||1063 - 1074|
|Section||Stellar structure and evolution|
|Published online||26 March 2004|
Spiral shock detection on eclipse maps: Simulations and observations*
Institute of Space Applications and Remote Sensing, National Observatory of Athens, PO Box 20048, Athens 11810, Greece
2 Departamento de Física, Universidade Federal de Santa Catarina, Campus Trindade, 88040-900 Florianópolis, Brazil e-mail: firstname.lastname@example.org
3 Department of Physics and Astronomy, Southampton University, Southampton SO17 1BJ, UK e-mail: email@example.com,firstname.lastname@example.org
4 High Energy Astrophysics Division, Center for Astrophysics, MS-67, 60 Garden Street, Cambridge, MA 02138, USA e-mail: email@example.com
Corresponding author: E. T. Harlaftis, firstname.lastname@example.org
Accepted: 27 December 2003
We perform simulations in order to reveal the effect of observational and physical parameters on the reconstruction of a spiral structure in an accretion disk, using eclipse mapping techniques. We show that a model spiral structure is smeared to a “butterfly”-shape structure because of the azimuthal smoothing effect of the technique. We isolate the effects of phase resolution, signal-to-noise ratio and accurate centering of the eclipse at zero phase. We further explore disk emissivity factors such as dilution of the spiral structure by the disk light and relative spiral arm difference. We conclude that the spiral structure can be satisfactorily recovered in accretion disk eclipse maps with phase resolution , and zero phase uncertainty , assuming the two spiral arms have similar brightness and contribute 30% to the total disk light. Under the light of the performed simulations, we present eclipse maps of the IP Peg accretion disk reconstructed from eclipse light curves of emission lines and continuum during the outburst of August 1994, where spiral shocks were detected with the aid of Doppler tomography (Morales-Rueda et al. [CITE]). We discuss how the detection of spirals shocks with eclipse mapping is improved with the use of velocity-resolved eclipse light curves which do not include any contaminating low-velocity emission.
Key words: stars: novae, cataclysmic variables / stars: individual: IP Pegasi / accretion, accretion disks / shock waves / methods: data analysis / line: formation / techniques: photometric
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.