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Planetary nebulae with close binary central stars
The observational record concerning planetary nebulae with close binarynuclei is surveyed, in light of a model for the formation of suchnebulae which predicts a characteristic, nonspherical morphology.Although agreement is found between the morphological prediction of themodel and the observed shapes of M2-9, NGC 6164-5, and MZ 3, cases arefound in which different observations yield different results withrespect to central star variability.
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Observation and Astrometry data
| Constellation: | Bélier |
| Right ascension: | 01h54m46.57s |
| Declination: | +17°33'08.9" |
| Apparent magnitude: | 8.474 |
| Distance: | 413.223 parsecs |
| Proper motion RA: | -2.4 |
| Proper motion Dec: | 6.4 |
| B-T magnitude: | 8.816 |
| V-T magnitude: | 8.503 |
Catalogs and designations:
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