Investigations on Proper Motion XVIII. The Proper Motions of Twenty-One Planetary Nebulae
Abstract
From photographs taken at the 80-foot focus of the 60-inch reflector proper motions were derived for fifteen more planetary nebulae, making a total of twenty-one nebulae. The mean interval between the old and the new plates is 12.22 years; the probable error of the mean motions is 0.0009" in α and 0.0010" in δ The results for the absolute motions of all twenty-one objects range from 0.0002" to 0.017", the mean being 0.007". The mean parallax derived from these results is about 0.0007", yielding an absolute photographic magnitude of +1.9 for the central stars and an absolute bolometric magnitude of -0.8
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1933
- DOI:
- 10.1086/143457
- Bibcode:
- 1933ApJ....77..186V