# Orbital eccentricity of the symbiotic star MWC 560

Source: [Orbital eccentricity of the symbiotic star MWC 560](<https://www.sota2.com/research/paper/68fa2f221e209131ce8697d7>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:53:36.585Z

Authors: R. K. Zamanov, A. Gomboc, K. A. Stoyanov, I. K. Stateva

Published: 2009-10-29T11:55:40.000Z

## Abstract

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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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0910.5621>)

[PDF](<https://arxiv.org/pdf/0910.5621.pdf>)