Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sciam.236...96a&link_type=abstract
Scientific American, vol. 236, Apr. 1977, p. 96-104.
Astronomy and Astrophysics
Astronomy
3
Binary Stars, Companion Stars, Extrasolar Planets, Spectroscopic Analysis, Doppler Effect, Eclipsing Binary Stars, Extraterrestrial Life, Stellar Magnitude, Stellar Spectrophotometry, Sun, Telescopes
Scientific paper
Searches for binary systems more likely to encompass planets sustaining some form of (intelligent) life are outlined and statistical analysis applied to a sample of 123 primaries is sketched. Periods of rotation, relative Doppler shifts, orbital speeds, orbit plane, positions on line of sight, perturbations if and when detectable, and reasons why many pairs are likley to escape detection are considered. Sunlike stars, visual doubles, astrometric doubles, spectroscopic binaries, eclipsing binaries, close and wide binaries, and bifurcation doubles (of near-equal mass) formed from rapidly rotating protostars are explained. The apparent distribution of evolved secondaries (67% normal stars, 20% planets from bodies of mass less than 0.01 solar mass, 15% nonluminous dwarfs), a Van Rhijn distribution, is cited, and uncertainties are noted.
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