Orbital eccentricity of the symbiotic star MWC 560
Abstract
We present projected rotational velocity measurements of the red giant in the symbiotic star MWC 560, using the high-resolution spectroscopic observations with the FEROS spectrograph. We find that the projected rotational velocity of the red giant is v sin i = 8.2 ± 1.5 km s-1, and estimate its rotational period to be P_rot = 144-306 days. Using the theoretical predictions of tidal interaction and pseudosynchronization, we estimate the orbital eccentricity e=0.68-0.82. We briefly discuss the connection of our results with the photometric variability of the object.
based on observations obtained in ESO program 074.D-0114- Publication:
-
Astronomische Nachrichten
- Pub Date:
- March 2010
- DOI:
- 10.1002/asna.200911297
- arXiv:
- arXiv:0910.5621
- Bibcode:
- 2010AN....331..282Z
- Keywords:
-
- binaries: close;
- binaries: symbiotic;
- stars: individual (MWC 560 = V694 Mon);
- stars: rotation;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- AN, accepted