Abell 39
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Planetary Nebula Abell 39 |
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| Image taken with the 81 cm reflecting telescope at the Mount Lemmon Observatory | |
| AladinLite | |
| Constellation | Hercules |
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Position equinox : J2000.0 |
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| Right ascension | 16h 27m 33.7s |
| declination | + 27 ° 54 ′ 33 ″ |
| Appearance | |
| Apparent brightness (visual) | integrated: 13.7 mag |
| Angular expansion | 155 ″, 1 × 154 ″, 5 |
| Central star | |
| Apparent brightness | 15.5 ± 0.2 mag |
| Physical data | |
| distance | 6800 ly (2100 pc ) |
| diameter | 0.8 pc 5 ly |
| history | |
| Catalog names | |
| PK 047 + 42 1 • PN G047.0 + 42.4 • ARO 180 | |
Abell 39 is a planetary nebula with low surface brightness in the constellation Hercules . The nebula is believed to be approximately 6800 light years from Earth and 4600 light years from the galactic plane . It has an almost spherical geometry.
Its name derives from the entry in George Abell's Abell Catalog of Planetary Nebulae from 1966.
Central star
The central star of the nebula is about 2 "(about 0.1 light-years) west of the center. This does not seem to be due to an interaction with interstellar matter, but to result from a slight asymmetry in the distribution of the ejected matter. The mass of the central star is assumed to be 0.6 M ☉ , while the ejected matter of the nebula has a mass of 0.6 M ☉ .
literature
- George Ogden Abell: Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey . In: Publications of the Astronomical Society of the Pacific . tape 67 , no. 397 , 1955, pp. 258 , doi : 10.1086 / 126815 , bibcode : 1955PASP ... 67..258A .
- George Ogden Abell: Properties of Some Old Planetary Nebulae . In: Astrophysical Journal . tape 144 , April 1966, p. 259 , doi : 10.1086 / 148602 , bibcode : 1966ApJ ... 144..259A .
- David Darling: Abell 39 . In: Internet Encyclopedia of Science . 2008 ( online ).
- George. H. Jacoby, Gary. J. Ferland, Kirk T. Korista: The Planetary Nebula A39: An Observational Benchmark for Numerical Modeling of Photoionized Plasmas . In: The Astrophysical Journal . tape 560 , no. 1 , October 10, 2001, p. 272–286 , doi : 10.1086 / 322489 , bibcode : 2001ApJ ... 560..272J .
Web links
- Image by George Jacoby et al.
- Spektrum .de: amateur recordings [1]
Individual evidence
- ↑ a b SIMBAD query
- ↑ a b c David Darling: Abell 39 . In: Internet Encyclopedia of Science . 2008 ( online ).
- ↑ a b c d e f g h i George. H. Jacoby, Gary. J. Ferland, Kirk T. Korista: The Planetary Nebula A39: An Observational Benchmark for Numerical Modeling of Photoionized Plasmas . In: The Astrophysical Journal . tape 560 , no. 1 , October 10, 2001, p. 272–286 , doi : 10.1086 / 322489 , bibcode : 2001ApJ ... 560..272J .
- ^ Robert Nemiroff (MTU), Jerry Bonnell (USRA): Abell 39. In: APOD, Astronomy Picture of the Day. NASA , July 28, 2005, accessed May 4, 2015 .
- ^ Abell: Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey. 1955, p. 258.
- ^ Abell: Properties of Some Old Planetary Nebulae. 1966, p. 259.