| Emission nebula | |
|---|---|
| Planetary nebula | |
 | |
| Observation data: J2000 epoch | |
| Right ascension | 15h 37m 11.2s[1] |
| Declination | −71° 54′ 52.9″[1] |
| Distance | 2200[2] pc |
| Apparent magnitude (V) | 10.47[1] |
| Constellation | Apus |
| Physical characteristics | |
| Absolute magnitude (V) | - |
| Notable features | - |
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 34,000 K. 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]
- ^ a b c "Hen 2-131". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-12-22.
- ^ a b 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. Bibcode:1998AJ....116.1357S. doi:10.1086/300504. S2CID 120862098.
- ^ Koelbloed, D. (1 March 1962). "A study of the low-excitation nebula around HD 138403". Bulletin of the Astronomical Institutes of the Netherlands. 16 (163): 163. Bibcode:1962BAN....16..163K. S2CID 119040150.
- ^ Henize, Karl G. (April 1967). "Observations of Southern Planetary Nebulae". The Astrophysical Journal Supplement Series. 14: 125. Bibcode:1967ApJS...14..125H. doi:10.1086/190151. ISSN 0067-0049. S2CID 120770338.
- ^ Mendez, R. H.; Niemela, V. S. (September 1979). "Observations of three central stars of planetary nebulae". The Astrophysical Journal. 232: 496. Bibcode:1979ApJ...232..496M. doi:10.1086/157308. ISSN 0004-637X. S2CID 121735341.
- ^ Hutton, R. G.; Mendez, R. H. (January 1993). "The Central Stars of He 2-131 SND He 2-138: Photometric Variations". Planetary Nebulae. Vol. 267. pp. L8. Bibcode:1993A&A...267L...8H. doi:10.1007/978-94-011-2088-3_229. ISBN 978-0-7923-2440-9. ISSN 0365-0138. S2CID 119605510.
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