Other
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997abos.conf..657z&link_type=abstract
Conference Paper, Astronomical and Biochemical Origins and the Search for Life in the Universe, IAU Colloquium 161, Publisher: B
Other
Interstellar Communication, Stellar Spectra, Earth (Planet), Emission Spectra, Signal Detection, Radio Telescopes, Narrowband, Line Spectra, Project Seti
Scientific paper
We report on a search for narrowband emissions from the vicinity of 36 solar type (F6 to K4) target stars and 13 other nonsolar-type stars within 11.5 parsec at five possible interstellar beacon frequencies of pi*f(H), 2pi*f(H), e*f(OH), e*(f(OH)+f(H)), and He-3 (4.462, 8.925, 4.532, 8.393, and 8.666 GHz respectively). The frequencies were selected by scaling important naturally occurring lines by fundamental constants. The stars were selected for a distance of less than 11.5 parsec to give sufficient time for a nearby civilization to have detected early Earth radio leakage signals and to have replied. The search was carried using the 64-m Parkes telescope with the Phoenix instrumentation and the 22-m Mopra telescope for candidate verification. The instrument combination allowed a low interference, high resolution, high sensitivity search. We did not detect any signals from any of the target stars. If a civilization at a distance of 10 pc had beamed 10 kW signals at us using a 100-m dish, we would have detected the transmission at the 10 sigma level. Thus we can exclude signals above this level.
Backus Peter R.
Blair David Gerald
Heiligman Gary
Norris Ray P.
Tarter Jill C.
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