Keck Adaptive Optics
Visible (850nm) imaging
This is the best image (from a resolution standpoint) recorded with
Keck II adaptive optics: Full width Half Maximum = 22.8
milliarcseconds, with a Strehl ratio of 6%. Wavelength of image = 850
Comparison of star imaged without, and with AO
(non-corrected image is on left)
This spectroscopic double has possibly been resolved optically
click on image for larger view
Separation is 52 milli-arcsec as measured by KCam with adaptive
Parallax for Sao64240 is 7.8 mas.
Observed in H band on two separate nights.
Frosty Leo (a post AGB star with a bi-polar nebula). In the visible
the central star is invisible so guiding was done on the lobes of the nebula.
The central star of the nebula has been observed as a double. Our
preliminary results do not show such a companion, but data reduction is
actively taking place to identify and remove artefacts.