Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital eccentricity of the symbiotic star MWC 560   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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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph