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1994PASP..106..356W - Publ. Astron. Soc. Pac., 106, 356-362 (1994/April-0)
Direct imaging of faint stellar companions.
WALKER G.A.H., WALKER A.R., RACINE R., FLETCHER J.M. and McCLURE R.D.
Abstract (from CDS):
We discuss the recognition and photometry of a faint star in the field of sigma Dra. Snapshots of Procyon yielded a separation of 5.2 arcsec, m_v = 11.3, B-V = +0.26, and B-I = +0.62 for its white dwarf companion.
The detection limits close to sigma Dra, tau Cet and epsilon Eri, are still some 5 magnitudes too bright for the detection of giant planets. Nonetheless, we remain optimistic that, with improving centering, the introduction of frame transfer CCDs, longer exposure times in the 15 percentile seeing at CFHT, and the use of other stars to define the telescope psf and fixed speckle background, it may be possible to realize these limits. Alt-azimuth telescopes present a special challenge!
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Simbad objects: 4
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