Astrobiologically interesting stars in the solar neighborhood

Details Astrobiologically interesting stars in the solar neighborhood Astrobiologically interesting stars in the solar neighborhood

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..128p&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 128-128

Mathematics

Logic

Scientific paper

We present a detailed, up-to-date compilation of data for the 50 solar-type stars within 10 pc of the Sun, selected from the Hipparcos catalogue with +0.40 < (B-V) < +1.15 and +2.00 < MV < +8.00. These objects are potentially interesting targets for SETI radio searches and space interferometry probes looking for telluric planets suitable for life based on carbon chemistry and water oceans. All selected stars are FGK dwarfs or subgiants. A detailed and modern data compilation on state of the evolution, atmospheric parameters, chemical composition, multiplicity and chromospheric activity for these objects is still essentially lacking: a considerable amount of recent data has so far gone unexplored in this context. We find that some objects previously listed as astrobiologically interesting targets turn out to: a) be previously unidentified multiple stars; b) be very young, chromospherically active, hard X-ray emitting objects, or flare stars; c) have very low metallicity, being presumably unable to build up telluric planets; d) be systems with brown dwarfs & giant planets in orbits potentially disruptive to planets in the continuously habitable zone; e) be subgiants too evolved to allow habitable planets to have survived their increased luminosity; f) have unexpectedly low abundances of key chemical elements for life origin such as carbon. We show that approximately 20 percent of the nearby solar-type stars are truly interesting targets for exobiology and we discuss their properties. A project to determine accurately and homogeneously their astrophysical properties is being launched.

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