Orbital eccentricity of the symbiotic star MWC 560

Details Orbital eccentricity of the symbiotic star MWC 560 Orbital eccentricity of the symbiotic star MWC 560

2009-10-29

arxiv.org/abs/0910.5621v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

AN, accepted

Scientific paper

We present projected rotational velocity measurements of the red giant in the symbiotic star MWC 560 (V694 Mon), using the high-resolution spectroscopic observations with the FEROS spectrograph. We find that the projected rotational velocity of the red giant is vsini = 8.2 +/- 1.5 km/s, 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.

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