منابع مشابه
Speckle Interferometry of Southern Double Stars. Ii. Measures from the Casleo 2.15 Meter Telescope, 1995è1996
Relative astrometry is presented for 198 observations of 160 double stars. The data were obtained at the 2.15 m telescope at the Complejo El Leoncito (Argentina) with a multianode microAstrono> mico channel array (MAMA) detector system. Five high-quality nondetections are also reported. When judged against ephemeris positions for binaries with very well determined orbits, the separation residua...
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In this paper we shall prove and sharpen a conjecture of A. Bialostocki on anti-Ramsey colorings of the complete graph Kn. Assume the edges of a Kn are colored by t colors. The basic question is how many colors ensure that Kn has a spanning subtree of diameter at most d in which each edge has a different color. The surprising fact is that the answers are the same for every d ≥ 3. Moreover, we c...
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I propose a scenario for the formation of double-ring systems, as observed in some planetary nebulae and in the outer rings of SN 1987A. In this scenario, two jets, one jet on each side of the equatorial plane, expand into a thin, dense shell. Such a flow is expected in binary systems where the mass-losing primary undergoes an impulsive mass loss episode which forms a thin, dense shell. I assum...
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Merger events of close double neutron stars (DNS) lie at the basis of a number of current issues in relativistic astrophysics, such as the indirect and possible direct detection of gravitational waves, the production of gamma-ray bursts at cosmological distances, and the origin of rprocess elements in the universe. In assessing the importance or relevance of DNS coalescence to these issues, kno...
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We report the first successful application of the astrometric color-induced displacement technique (CID, the displacement of the photocenter between different bandpasses due to a varying contribution of differently colored components to the total light), originally proposed by Wielen (1996) for discovering unresolved binary stars. Using the Sloan Digital Sky Survey (SDSS) Data Release 1 with ∼ ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1915
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/76.1.24