Astrometric Companions Detected at Visible Wavelengths with the Hubble Space Telescope Fine Guidance Sensors

Astronomy and Astrophysics – Astronomy

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Scientific paper

Astrometric (``unseen'') companions provide a plausible interpretation of periodic, low--amplitude variations (perturbations) in the proper motions of some nearby M--dwarfs (Lippincott 1978, Space Sci. Rev. 22, 153--189). Using the Fine Guidance Sensors (FGS) in the Transfer Function Scan mode, we have searched for five of these astrometric companions. We report the confirmed detection, at visible wavelengths, of a faint orbiting companion to each of the following M--dwarfs: BD+67.552 = GL310, AC+48.1595-89 = GL623, W1062 = GL748, and W922 = GL831. This work is supported by NASA under grant NAG5--1603 to UTexas.

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