منابع مشابه
EMISSION-LINE OBJECTS FROM A PRELIMINARY UKST OBJECTIVE PRISM SURVEY
A visual search has been made of four fields using United Kingdom 1.2m Schmidt Objective Prism plates with a reciprocal dispersion of 1 180 A/mm at HP. Such plate material is ideally suited to searches for emission-line galaxies. We present a catalogue of 53 emission-line objects, which comprises 45 galaxies, where individual HI1 regions are resolved in 16 bright galaxies; 8 are emission li...
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Searching for extrasolar planets by direct detection is extremely challenging for current instrumentation. Indirect methods, that measure the effect of a planet on its host star, are much more promising and have indeed led to the discovery of nearly all extrasolar systems known today. While the most successful method thus far is the radial velocity technique, new interferometric instruments lik...
متن کاملGlobal astrometry with OSI
— The Orbiting Stellar Interferometer is a proposed space-based interferometer which makes very accurate wide-angle astrometric measurements on several thousand stars. As opposed to Hipparcos, OSI does not have a “basic angle” between two separate field-of-views but three separate interferometers and a highly accurate metrology system. The questions addressed in this paper are whether it is pos...
متن کاملThe Missing Cv Population: Results from an Objective Prism Survey
We present the results of a search for cataclysmic variables (CVs) in the Calán-Tololo survey. We detected a total number of 21 CVs, 12 of them are previously unknown objects. Our results suggest that the mismatch between the theoretically predicted sample and the observed one is not due to observational bias but has to be resolved by a revision of the theoretical models. 1. The survey Theoreti...
متن کاملDetection of Spectra in Objective Prism Images Using Neural Networks
Some methods for the automatic detection of spectra in objective prism images have already been developed, but none of them is completely satisfactory, and an interactive session including a visual check is always necessary. In this paper, a neural network approach is proposed to solve this problem. A multi{layer feed forward neural network has been developed to distinguish single, multiple or ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1986
ISSN: 0074-1809
DOI: 10.1017/s007418090007666x