SETI in star clusters: a theoretical approach |
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Authors: | R de la Fuente Marcos C de la Fuente Marcos |
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Institution: | 1. Suffolk University Madrid Campus, C/ de la Vi?a 3, E-28003, Madrid, Spain 2. Universidad Complutense de Madrid, Ciudad Universitaria, E-28040, Madrid, Spain
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Abstract: | For several decades, the search for extraterrestrial intelligence (SETI) has proceeded using advanced astronomical techniques.
Different strategies have been proposed for target selection for targeted searches with goals of improving the chances of
successful detection of signals from technological civilizations that may inhabit planets around solar-type stars, and to
minimize the chances of missing signals from unexpected sites. In this paper we demonstrate that these goals are best achieved
by observing star clusters. We show that standard open clusters are not appropriate for SETI scans because their disruption
time scale is shorter than the characteristic time scale for the development of a protective atmospheric layer on a habitable
planet. However, the old open clusters, those older than some Gy are optimal candidates for SETI surveys as their ages are
older than the likely time for intelligent civilizations to emerge and the probability of catastrophic orbital modification
as a result of close encounters with other cluster stars is, in general, rather negligible. The final performance of the proposed
survey can be significantly increased by using initially a radio telescope beam larger than the cluster apparent size so that
the entire cluster can be observed simultaneously. Globular clusters are also good candidates from the statistical point of
view but only if hypothetical civilizations located in these clusters have been able to develop astronomical engineering technologies
or have been involved in (rather speculative) cosmic colonization.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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