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  • 1
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    Infrared point sources aligned with the SgrA(asterisk) non-thermal radio source (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Assembled 0.7-5.0 micron observational data for two point sources approximately aligned with the compact nonthermal radio source SgrA(asterisk) in the Galactic center, thus far interpreted as being from the same object on the basis of their position and spectral continuity, are presently given alternative interpretations. While the object must be a hot star surrounded by a circumstellar dust cloud if it is a foreground star, a Galactic center position calls for an unorthodox extinction curve which suggests that the IR emission may be the Rayleigh-Jeans tail of a hot star or star cluster, or perhaps a thermal accretion disk.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 323; 232-234
    Format: text
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  • 2
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    Sagittarius A(asterisk) and the positions of infrared sources in the galactic center (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Observations of the central region of the Galaxy have been made with the University of Rochester 32 x 32 element InSb array camera in the 1-5 micron wavelength range. The 2.2-micron images have been used to determine positions of infrared features in comparison with that of the galactic center compact radio source Sgr A(asterisk). No infrared source lies precisely at the Sgr A(asterisk) position in the images. However, the infrared source closest to the Sgr A(asterisk) position is a previously little studied source directly south of IRS 7 that was called IRS 16NW and not the often referred to IRS 16C. IRS 16NW is coincident with one of the very red objects seen in various 1-micron images of this region.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 301; L49-L52
    Format: text
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  • 3
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    A map-based determination of the nature of Beta Delphini (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Beta Delphini binary system presents a stringent test of the theory of stellar evolution. Improved parallax and component masses are found for its giant (F5 III and F5 IV) stars. A study of the evolutionary status of the system indicates it to be 1.9 Gyr (1.9 billion years) old and to have a metallicity of approximately 1.5 times that of the Sun. The perturbation due to the 26.6 yr orbital motion is clearly shown in this 2.2 yr study and allows the most precise determination of the relative masses of the component stars to date. The next few months present an unusual opportunity for orbital study as the system passes through periastron. Two of the reference stars are found to have distances of less than 100 parsecs.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 1085-109
    Format: text
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  • 4
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    A no hair theorem and the problem of initial conditions (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is shown that under very general conditions, any inhomogeneous cosmological model with a positive cosmological constant that can be described in a synchronous reference system will tend asymptotically in time towards the de Sitter solution. This renders the problem of initial conditions less severe.
    Keywords: ASTROPHYSICS
    Type: Origin and early history of the universe; Jul 01, 1986 - Jul 04, 1986; Liege; Belgium
    Format: text
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