Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
1)
M. Schöller, I.I. Balega, Y.Y.
Balega,
K.-H. Hofmann, T. Reinheimer
and G. Weigelt:
Diffraction-limited speckle masking
interferometry of binary stars with
the SAO 6-m telescope
Pis'ma Astron. Zh. 24, 337-342 (1998), english
translation in
Astronomy Letters 24, 283-288 (1998)
Abstract.
Optical speckle masking observations of 32 binary and multiple stars
with the
SAO 6-m telescope are presented. The
resolution of the reconstructed diffraction-limited images is 23 mas at
656 nm. Accurate magnitude differences were first
determined for most binaries.
The results for individual systems are compared with the available
orbits
and with published photometric data. A new close visual component was
discovered in the multiple system ADS 784.
You can get this publication ...
2)
I.I. Balega, Y.Y. Balega, K.-H.
Hofmann, and G. Weigelt:
Infrared Speckle Interferometry of Eleven
Binaries Using a Bispectral Analysis
Astronomy Letters 27, 95-98 (2001)
Abstract.
Infrared speckle-masking observations of eleven binary systems with the
6-m Special Astrophysical Observatory telescope are presented. A
resolution of 43 mas in J (1.25 µm) and 76
mas in K (2.2 µm) has been achieved in reconstructed images. Accurate
magnitude differences, separations, and position angles have been
determined
for all the resolved binaries. The
pair HR 1071 with an abnormally low lithium abundance is considered in
more
detail.
You can get this publication ...
3)
Balega, I. I.; Balega, Yu. Yu.;
Falcke, H.; Osterbart, R.; Reinheimer, T.; Schöller, M.; Weigelt, G.
Speckle interferometry of the spectroscopic
binaries Gliese 150.2 and 41 Draconis
Astronomy Letters, v.23, No.2, p.172-176 (1997)
Abstract
We present the first diffraction-limited, visible and
infrared speckle masking observations of the nearby
spectroscopic binaries Gl 150.2 and 41 Dra performed with
the 6-m telescope. Gl 150.2 is a pair of K0 and M0 dwarfs
with a magnitude difference of 2![[roman m over dot]](http://scitation.aip.org/stockgif2/dotmin.gif)
49 ± 005 in the red. Its
orbital period is close to ten years. A preliminary
apparent orbit was derived for the pair 41 Dra with
double-lined F7 V components from six speckle measurements.
The masses of the components of 41 Dra determined with an
error of ±16 are 1.26µ![[sun]](http://scitation.aip.org/stockgif2/odot-script.gif)
and 1.18µ. Their absolute
magnitudes, M
= 2.92 and
M
= 3.30,
place them 08 above the
main-sequence stars of the same spectra range.
You can get this publication ...
4) I.I. Balega, Y.Y. Balega, K.-H.
Hofmann, E.A. Pluzhnik, D.
Schertl, Z.U. Shkhagosheva and G. Weigelt
Orbits of new Hipparcos binaries. I*
Astronomy and Astrophysics, 433 (Issue 2),
p.591-596 (2005)
Abstract
We present first orbits for 6 new Hipparcos binaries. The orbits were
determined from speckle interferometric measurements collected mainly
at
the6m BTAtelescope of the Special Astrophysical Observatory in
Zelenchuk. Three of the systems, HIP 11352, HIP 14075 and
HIP 14230, have late G- or early K-type components, while
HIP 14669 = GJ 125, HIP 106972 = GJ 4210 and
HIP 111685 = GJ 4287 have M-type components. The periods
of the orbits are in the range of6-28years. Mass sums and their errors
are derived for the systems. The Hipparcos parallax error is the
dominating error source of themass determination.
Based on observations made with the 6-m BTA telescope, which is
operated
by the Special Astrophysical Observatory, Russia.
You can get this publication ...
5) Balega,
I.I., Balega, Y.Y., Hofmann,
K.-H., Malogolovets, E.V., Schertl, D., Shkhagosheva, Z.U., Weigelt, G.
Orbits of new Hipparcos binaries.II.
Astronomy & Astrophysics, 448, pg.703-707 (2006)
Abstract
We continue the presentation of new orbits for Hipparcos binaries
determined from regular speckle interferometric
observations. Most of the data were collected
in the period between 1998.77 and 2004.82 using the 6 m
BTA telescope of the Special Astrophysical Observatory
in Zelenchuk. New orbits are presented for six pairs: HIP 4809, HIP
4849, HIP 5531, HIP 19206, HIP 105947, and HIP 114922.
One of the pairs, HIP 114922, has M dwarf components orbiting with a
period of 19.72 yr. Two binaries, HIP 4809
and HIP 5531, have luminosity class IV components.
The periods of the orbits range from 7.30 yr
to 28.99 yr.
All of the orbits can be considered definitive; however, the
total mass error for the systems remains high,
mainly due to
Hipparcos parallax error.
You can get this publication ...
