Astronomy:Abell 70
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Short description: Planetary nebula in the constellation Aquila
| Emission nebula | |
|---|---|
| Planetary nebula | |
 As seen from Mount Lemmon Observatory | |
| Observation data: J2000 epoch | |
| Right ascension | 20h 31m 33.2s |
| Declination | −07° 05′ 17″ |
| Constellation | Aquila |
| Notable features | A background galaxy gives it a "diamond ring" effect |
| Designations | PK 038-25.1, PN G038.1-25.4 |
Abell 70 is a planetary nebula located 13,500-17,500 light years away in the constellation of Aquila. It is approaching the earth at 79 kilometers per second and expanding 38 kilometers per second. There is a galaxy named PMN J2033-0656 behind Abell 70, giving it a "diamond ring" effect.[1]
Composition
The faint OIII ring structure can be seen through a telescope.[2] The central star of Abell 70 is a binary star system consisting of a hot white dwarf and a G-type subgiant star.[3] The subgiant star is a barium star[1] that rotates rapidly (with a period of about 2 days) and is variable due to starspots.[3]
Background galaxy
| PMN J2033-0656 | |
|---|---|
| Observation data (J2000 epoch) | |
| Right ascension | 20h 31m 33.1s[4] |
| Declination | −07° 05′ 01″[4] |
| Distance | 253 Mly (78 Mpc)[5] |
| Characteristics | |
| Apparent size (V) | 1.1' × 0.3'[4] |
| Other designations | |
| 2MASX J20313312-0705014, 6dFGS gJ203133.1-070502, PGC 187663, LEDA 187663, NVSS J203133-070522[6] | |
PMN J2033-0656 is an edge-on radio galaxy. Its position gives Abell 70 a diamond ring effect at its northern edge.[1]
See also
References
- ↑ 1.0 1.1 1.2 "Anne's Image of the Day: Planetary Nebula Abell 70". 30 November 2013. http://www.annesastronomynews.com/annes-image-of-the-day-planetary-nebula-abell-70/.
- ↑ Gottlieb, Steve (16 August 2001). "Best Abell Planetaries: Summer". http://www.astronomy-mall.com/Adventures.In.Deep.Space/abell3.htm#abell70.
- ↑ 3.0 3.1 Jones, David; Boffin, Henri M J.; Brown, Alex J.; Zak, Jiri; Hume, George; Munday, James; Miszalski, Brent (2022). "A detailed study of the barium central star of the planetary nebula Abell 70". Monthly Notices of the Royal Astronomical Society 516 (4): 4833–4843. doi:10.1093/mnras/stac2501. Bibcode: 2022MNRAS.516.4833J.
- ↑ 4.0 4.1 4.2 "Results for 2MASX J20313312-0705014". NASA/IPAC Extragalactic Database. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=2MASX+J20313312-0705014&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ "Astronomical Image Catalog: PNABELL70". http://images.mantrapskies.com/catalog/OTHER/PNABELL70/index.htm.
- ↑ "PGC 187663". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=PGC+187663.
External links
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