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Speckle interferometry of R Leo at the 6-m BTA telescope
The measurements of the apparent diameter of a long-period variable
star R Leo, a cold pulsating giant in the last stage of evolution,
the scales of which are hundreds of times larger than the Sun were
conducted at the 6-m BTA telescope.
We succeeded to accumulate homogeneous data on its apparent diameter
in different phases of pulsation, from 0.043 to 0.056 arcsec with
record accuracy of 0.002 arcsec. The asymmetry of the stellar profile
was discovered during the observations in the H alpha line and in the
absorption band of the titanium oxide TiO molecule. The obtained
results help to explain the nature of the pulsations of this rare
class of stars.
(Contact - V.V.Dyachenko)
Detection of the millennial cyclical component in the evolution
of rotation of single radio pulsars
Based on the analysis of properties of three hundred radio pulsars,
the existence of millenary cycles in the slowdown of their rotation
was discovered. This phenomenon seems to be associated with the complex
rotation of the neutron star, precessing about the direction of its
magnetic moment. The discovered effect explains the observed anomalously
large values of the pulsar slowdown indices, as well as the known
differences in the estimates of their ages with the ages of the
corresponding supernova remnants. The parameters of cyclical and
secular components of dragging were determined for the first time.
The latter proved to be close to the modern predicted models of
the pulsar energy loss.
In collaboration with the SAI MSU
(Contact - G.M.Beskin)
Published: Astrophysical Bulletin, 2011, v.66, p.478
MNRAS, 2012, v.420, p.103
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