Y. Balega

Multiplicity of the massive stars in the Orion Nebula cluster

An improved metal-core weld wire, usable for joint and surface welding, having a steel sheath with a core, and a core composition disposed in the core of the steel sheath, wherein the core composition is between approximately 0.001-12.0% total weight of the metal-core wire. The metal-core wires of the present invention have improved manufacturability. In another embodiment, the core composition includes iron powder in an amount that provides an oxygen content less than approximately 600 ppm in the metal-core wire for producing weld deposits with improved impact strength properties.

Speckle interferometry of nearby multiple stars. II.

We present the results of diraction-limited optical speckle interferometry and infrared bispectrum speckle interferometry of 111 double and 10 triple systems performed in 1998{1999 with the 6-m telescope of the Special Astrophysical Observatory in Zelenchuk. The observations concentrated on nearby close binaries discovered during the Hipparcos mission. Many nearby fast-orbiting low-mass binaries known before Hipparcos were also included in the program. New companions were rst resolved in 4 systems: HIP 5245, ADS 3179, Kui 99, and ADS 16138. In addition to accurate relative positions, magnitude dierences were measured for most of the pairs. We combined our results with the Hipparcos parallaxes to derive absolute magnitudes and spectral types for 63 binaries and 4 triples. Preliminary orbital elements and the mass-sum are derived for HIP 689, and improved orbits are presented for HIP 16602 (CHR 117) and HIP 21280 (CHR 17).

Structure and physical properties of the rapidly evolving dusty envelope of IRC + 10216 reconstructed by detailed two-dimensional radiative transfer modeling

We present the first detailed, two-dimensional radiative transfer model of the dusty envelope around the carbon star IRC + 10216. Our goal was to find a self-consistent model of the star and its envelope which takes into account as many observational constraints as possible. The model reproduces very well the entire beam-matched spectral energy distribution of IRC + 10216 from optical to centimeter wavelengths (at several phases of stellar luminosity), observed intensity profiles of the object at 1.25, 2.2, 10.5, 50, 100

Diffraction-limited bispectrum speckle interferometry of the nuclear region of the Seyfert galaxy NGC 1068 in the H and K' bands

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Bispectrum speckle interferometry of IRC +10216: The dynamic evolution of the innermost circumstellar environment from 1995 to 2001

m, and 1.3 mm, a 10.5

Close binary companions of the HAeBe stars LkHα 198, Elias 1, HK Ori and V380 Ori

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Bispectrum speckle interferometry of the massive protostellar outflow source AFGL 2591

m lunar occultation intensity profile, our high-resolution

Bispectrum speckle interferometry of the massive protostellar object S140 IRS 1: Evidence for multiple outflows ?

J, H

Gliese 569b: a young multiple brown dwarf system?

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Bispectrum speckle interferometry of the B(e) star MWC 349A

H\!-\!K