Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sci...201..733h&link_type=abstract
Science, vol. 201, Aug. 25, 1978, p. 733-735.
Astronomy and Astrophysics
Astronomy
2
Bandwidth, Extraterrestrial Intelligence, Interstellar Communication, Project Seti, Radio Astronomy, Signal Detection, Atomic Spectra, Centimeter Waves, Fast Fourier Transformations, Hydrogen, Line Spectra, Microwave Emission
Scientific paper
The reported search for extraterrestrial intelligence was based on the assumption that a narrowband acquisition beacon is transmitted near the neutral hydrogen frequency (1420 MHz). Extremely narrow bandwidths would provide the simplest means of achieving a high signal-to-noise ratio, as well as suggesting the presence of artificial signals. A search strategy based on this assumption consists simply of observing likely stars, such as F, G, and K main-sequence dwarfs, at a terrestrial frequency corresponding to the laboratory hydrogen frequency in the heliocentric rest frame. For the search a total bandwidth of 1 kHz was used. The observations were carried out during January to April 1978. Observations were made on target stars taken from the Royal Greenwich Observatory catalog. Altogether 185 objects were examined, 60 of them on more than one occasion.
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