Schielicke, Astronomische Gesellschaft 1999, p. Reference: Röser, S., 1999, DIVA - Beyond HIPPARCOS and Towards GAIA, in: Rev. SIM - the Space Interferometry Mission - will be the first of a new generation of space instruments using interferometry. In this poster we present a few examples of astrophysical topics where DIVA can open new horizons. This principle was extended to astronomy by using two or more separate mirrors whose. In the last two years the feasibility of DIVA has been demonstrated in a study with industry, and a careful assessment of the astronomical performance has been carried out. Speckle interferometry measurements of close visual binaries were. By providing a wealth of high-quality observational data, DIVA will influence almost every field of astronomy. DIVA (Double Interferometer for Visual Astrometry) is a small satellite planned for launch in 2003. The performance of DIVA will significantly exceed that of the famous HIPPARCOS mission in all important aspects. Additionally, broad-band photometry will be obtained for all these 35 million objects, together with multi-channel intermediate-band photometry for the brightest 10 million stars (V <= 13.5). DIVA will measure the positions, proper motions and parallaxes of all stars down to 15th visual magnitude. Other methods are insensitive to this fundamental property. Astrometry and RV provide information about the masses of companions to nearby stars. If launched in 2003, final data from DIVA will be available in 2007. The Section publishes these Circulars which contain measures of visual double stars using micrometers, CCD cameras and on-line astrometry as well as a. Astrometry has a number of advantages over other techniques. This decade has seen the influence of stellar interferometry extend beyond classical regimes of stellar diameters and binary orbits to new areas such as mapping the accretion discs around young stars, novel calibration of the cepheid period-luminosity relation, and imaging of stellar surfaces. RV is most effective for slowly rotating, mid-to-late-type stars. The poster presents a brief overview of the scientific objectives of the planned astrometric and photometric minisatellite DIVA (Double Interferometer for Visual Astrometry), to be built in collaboration of several German astronomical institutes. A new method of ground-based dierential astrometry with measurement precisions on the order of 105 arc-seconds for bright stars separated by 0.051.0 arcseconds has been developed for use at the Palomar Testbed Interferometer. Astrometry is effective in regimes where RV has reduced precision: (a) Astrometry can operate over a wide range of stellar masses, rotational velocities, and spectral types to better explore relationships between the properties of the host star and its planetary system.
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