Abstract
We observed the large and faint planetary nebula around IN Com in H alpha and N II light with a coronagraphic charge-coupled device on the Wise Observatory reflector, blocking the light from the central star. Our goal was to provide a second image of the object with which to confirm the features seen in the only published photograph from the paper by Longmore & Tritton reporting the discovery of this object. The nebula is extremely faint, but a combination of images totalling about one and a half hours of exposure shows it fairly well. A novel image processing algorithm has been applied to the noisy image in order to reveal faint extended details of the images, The algorithm is based on a non-linear self-adaptive filter applied to the wavelet transform of the image, The nebula is not round or elliptical, but shows a two-lobed or possibly three-lobed morphology, as well as a peculiar hole-like feature east of the central star. There is definite east-west and slightly less definite north-south asymmetry.
Original language | English |
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Pages (from-to) | 241-245 |
Number of pages | 5 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 305 |
Issue number | 2 |
Publication status | Published - 11-May-1999 |
Keywords
- binaries : close
- circumstellar matter
- stars : imaging
- stars : individual : IN Com
- planetary nebulae : individual : LoTr 5
- CENTRAL STAR
- BINARY NUCLEI
- TRIPLE SYSTEM
- LT-5
- MORPHOLOGIES