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High-Resolution Observations of Four Planetary Nebulae in the Magellanic Clouds Using the Faint Object Camera and the Hubble Space Telescope
Abstract
We present optical images of four planetary nebulae in the Magellanic
Clouds observed at a resolution of 0.1 arcsec with HST. Each object was
imaged through the narrow band filters, F486N for Hβ lambda 4861,
and F501N for [OIII] lambda lambda 4959, 5007. Images were obtained with
the f/96 camera of the FOC in the usual 512x512 pixel(2) format which
has nominally square pixels of 24microns on a side, corresponding to
0.0224 arcsec on the sky. The data were processed through the STScI
calibration pipeline. Images were flat fielded and then geometrically
corrected. The flat field removes large scale non-uniformities over the
image but does not correct for pixel-to-pixel non-uniformities. The
geometric correction provides a uniform plate scale. The calibrated
images have been deconvolved using the Lucy method. All objects are
fully resolved and their morphology is described in this paper. The most
remarkable planetary nebula is LMC N66, which turns out to be bipolar
extending 2 arcsecs over the brightest part. The nebula structure is
very complex showing a central star flanked by 2 bright lobes; three
faint loops extend out from the lobes, covering several arcsecs on the
sky. In addition, four knots of emission around the object are detected.
The two SMC planetaries show single shells in [OIII] with diameters 0.25
arcsec for N2 and 0.27 arcsec for N5.
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