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Accuracy of Radial Velocity Measurements Enhanced on BTA.
As a result of usage of an absorption cell, the accuracy of measurements
of Doppler shifts on BTA's stellar spectrographs was increased by more
than an order (
Vr=20-30 m/s).
Program for Finding Photometric Distances to Nearby Galaxies.
A programme was elaborated to measure high-precision photometric distances
to nearby (resolved into stars) galaxies according to the Tip of the Red
Giants Branch (TRGB) method. The use of a maximum likelihood method and
photometric accuracy assessment with an application of expanded statistical
modeling of dense star fields allowed to increase the accuracy of distance
finding using the TRGB method up to 5-8%, which is comparable to the
accuracy of a Cepheid distance indicator. This method has no equal as of
its versatility and short observation times.
Test Observations on RATAN-600 with MARS-3 16-Channel Matrix System.
First observations were made on RATAN-600 with a unique MARS-3 16-channel
(32 inputs) Matrix Radiometric System that has no analogue in Russian
radio astronomy. The use of such system in a mode when radio sources
propagate through a fixed diagram of the antenna, allows quadrupling
of radiotelescope's sensitivity compared to one-channel radiometer and
decreases the time of signal collection from weak objects by 16 times.
Centre for Analysis of Multiwave Observations Created on RATAN-600.
An on-line processing centre for analysis of multiwave radio observations
of the Sun on RATAN-600 was created in the St.Petersburg Branch of SAO RAS,
see
http://www.spbf.sao.ru/prognoz/.
Its functions include automatic polling of multiwave length data from
RATAN-600, all radioheliographs and satellite observatories; full data
processing and correlation, and multi-format submission to the end users.
The Centre is dedicated to the creation of a generalized forecast of
solar activity based on detailed spectrum of radio frequency observations
of the Sun and for students' labs.
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