Hen 2-131 Explained
| Hen 2-131 |
| Type: | Planetary |
| Epoch: | J2000 |
| Ra: | [1] |
| Dist Pc: | 2200[2] |
| Appmag V: | 10.47 |
| Constellation: | Apus |
| Absmag V: | - |
| Notes: | - |
Hen 2-131 is a planetary nebula in the southern constellation of Apus. It was discovered by Andrew David Thackeray in 1950[3] and added to the Catalogues of Hα-emission Stars and Nebulae in the Magellanic Clouds by Karl Gordon Henize in 1967.[4]
Hen 2-131 is about 2,200 pc from earth.[2] HD 138403 is the star located in the center of Hen 2–131 with a spectral type of O8(f)ep.[5] The nebula expands at a speed of 11.5 km/s, and the temperature of HD 138403 is about . HD 138403 is suspected of variability, possibly by 0.1 to 0.15 magnitudes over a period of several hours. This nebula is similar to IC 418, IC 4593 and Hen 2-138.[6]
Notes and References
- Hen 2-131. 2006-12-22.
- Sahai . Raghvendra . Trauger . John T. . September 1998 . Multipolar Bubbles and Jets in Low-Excitation Planetary Nebulae: Toward a New Understanding of the Formation and Shaping of Planetary Nebulae . The Astronomical Journal . 116 . 3 . 1357–1366 . 1998AJ....116.1357S . 10.1086/300504 . 120862098 . free .
- Koelbloed. D.. A study of the low-excitation nebula around HD 138403. Bulletin of the Astronomical Institutes of the Netherlands. 16. 163. 1 March 1962. 163. 1962BAN....16..163K. 119040150.
- Henize . Karl G. . April 1967 . Observations of Southern Planetary Nebulae . The Astrophysical Journal Supplement Series . en . 14 . 125 . 1967ApJS...14..125H . 10.1086/190151 . 0067-0049 . 120770338 .
- Mendez . R. H. . Niemela . V. S. . September 1979 . Observations of three central stars of planetary nebulae . The Astrophysical Journal . en . 232 . 496 . 1979ApJ...232..496M . 10.1086/157308 . 0004-637X . 121735341 . free .
- Book: Hutton . R. G. . Mendez . R. H. . Planetary Nebulae . The Central Stars of He 2-131 SND He 2-138: Photometric Variations . January 1993 . Astrophysical Journal Supplement . en . 267 . L8 . 10.1007/978-94-011-2088-3_229 . 1993A&A...267L...8H . 978-0-7923-2440-9 . 0365-0138 . 119605510 .
