Rotational velocities of the giants in symbiotic stars: III. Evidence of fast rotation in S-type symbiotics

Abstract

We have measured the projected rotational velocities (vsini) in a number of symbiotic stars and M giants using high resolution spectroscopic observations. On the basis of our measurements and data from the literature, we compare the rotation of mass-donors in symbiotics with vsini of field giants and find that: (1) the K giants in S-type symbiotics rotate at vsini>4.5 km/s, which is 2-4 times faster than the field K giants; (2) the M giants in S-type symbiotics rotate on average 1.5 times faster than the field M giants. Statistical tests show that these differences are highly significant: p-value < 0.001 in the spectral type bins K2III-K5III, M0III-M6III, and M2III-M5III; (3) our new observations of D'-type symbiotics also confirm that they are fast rotators. As a result of the rapid rotation, the cool giants in symbiotics should have 3-30 times larger mass loss rates. Our results suggest also that bipolar ejections in symbiotics seem to happen in objects where the mass donors rotate faster than the orbital period. All spectra used in our series of papers can be obtained upon request from the authors.

MNRAS (accepted), 7 pages, 5 figures

References in corpus (4)

• Hubble Space Telescope Imaging of the Expanding Nebular Remnant of the Recurrent Nova RS Ophiuchi (2006)
• Rotation and Macroturbulence in Metal-poor Field Red Giant and Red Horizontal Branch Stars
• Rotational velocities of the giants in symbiotic stars: II. Are S-type symbiotics synchronized?
• Line Broadening in Field Metal-poor Red Giant and Red Horizontal Branch Stars

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• Formation and Evolution of Accreting Compact Objects
• The effect of aspherical stellar wind of giant stars on the symbiotic channel of type Ia supernovae
• The symbiotic binary St 2-22: Orbital and stellar parameters and jet evolution following its 2019 outburst
• Determining rotational and macroturbulent velocities of cool magnetic giant stars
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• Density asymmetry and wind velocities in the orbital plane of the symbiotic binary EG Andromedae