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Astron. Astrophys. 336, L73-L76 (1998)
Letter to the Editor
Spiral shocks in the accretion disk of the dwarf nova U Geminorum
V.V. Neustroev 1, 2 and
N.V. Borisov 2
1 Department of Astronomy and Mechanics, Udmurt State
University, 1, Universitetskaia, 426034, Izhevsk, Russia (e-mail:
benj@uni.udm.ru)
2 Special Astrophysical Observatory, Nizhnij Arkhyz,
357147, Karachaevo-Cherkesia, Russia (e-mail: borisov@sao.ru)
Received 27 April 1998 / Accepted 7 July 1998
Abstract
We present a study of the observable spectral manifestations
associated with spiral shocks within quiescent accretion disks and
compare them with observations of the dwarf nova U Geminorum. Our
results indicate that the orbital behaviour of the hydrogen emission
line profile in the spectrum of U Gem can be reproduced via a simple
model of the accretion disk with two symmetrically located spiral
shocks with the spiral angle ![[FORMULA]](img1.gif)
about
60o. This provides for the first time convincing evidence
for the existence of spiral shocks in the accretion disk of a
cataclysmic variable in quiescence.
Key words: accretion, accretion
disks 
line: profiles
line: formation
novae, cataclysmic
variables
stars: individual: U Gem
Send offprint requests to: V.V. Neustroev (first address)
Contents
- 1. Introduction
- 2. U Gem: observations and results
- 3. Modelling
- 4. Analysis and comparison with observations
- 5. Conclusion
- Acknowledgements
- References
© European Southern Observatory (ESO) 1998
Online publication: July 27, 1998
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