Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975spam.rept..121v&link_type=abstract
In ESRO Space Astrometry p 121-127 (SEE N75-30957 21-89)
Astronomy and Astrophysics
Astronomy
Astrometry, Companion Stars, Visibility, Astronomical Photography, Perturbation, Stellar Mass, Surveys
Scientific paper
A survey is presented of the total population of unseen companions, based on a minute and selective sample. Chances of finding perturbations of short periods, say less than 10 years, diminish with increasing distance. Perturbations with longer periods, say less than 25 years or more, and for more distant stars can only be discovered by a series of observations spread over decades, if not centuries. It is clear that discoveries of companions of very small mass, say less than the generally adopted value of 0.06 M for the lowest mass of a normal star, and of planetary companions are most promising for the very nearest stars. There is reason therefore to strive for the highest possible positional accuracy for a limited number of the very nearest stars.
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