Volume 389, Number 2, July II 2002
|Page(s)||485 - 493|
|Section||Interstellar and circumstellar matter|
|Published online||27 June 2002|
Distortion of secondaries in semi-detached binaries and the cataclysmic variable period minimum
C.R.A.L (UMR 5574 CNRS), École Normale Supérieure, 69364 Lyon Cedex 07, France e-mail: vrenvoiz, firstname.lastname@example.org
2 Max-Planck Institut für Astrophysik, Karl-Schwarzschild-str.1, 85741 Garching, Germany e-mail: email@example.com
3 Department of Physics & Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK e-mail: firstname.lastname@example.org
Corresponding author: V. Renvoizé, email@example.com
Accepted: 15 April 2002
Based on SPH simulations, we quantify the geometrical distortion effect due to tidal and rotational forces on polytropic secondaries in semi-detached binaries. The main effect is an expansion of the polytropic star, with an effect on the radius of ~5%–12%, depending on the polytropic index and the mass ratio. We apply such distortion effects to the secular evolution of secondaries in cataclysmic variable systems. We focus on systems below the 2–3 h period gap and that approach the minimum period. We find a significant increase of the predicted minimum period (~4% if changes in the secondary's thermal relaxation are approximately taken into account). Though an improvement, the effect is not big enough to solve the mismatch between predicted and observed minimum period at 80 min.
Key words: stars: binaries: close / stars: low-mass, brown dwarfs / stars: evolution / stars: novae, cataclysmic variables
© ESO, 2002
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.