Hen 2-131

Short description: Planetary nebula in the constellation Apus

Template:Infobox planetary nebula Hen 2-131 is a planetary nebula in the southern constellation of Apus. It was discovered by Andrew David Thackeray in 1950[1] and added to the Catalogues of Hα-emission Stars and Nebulae in the Magellanic Clouds by Karl Gordon Henize in 1967.[2]

Hen 2-131 is about 2,200 pc from earth.[3] HD 138403 is the star located in the center of Hen 2–131 with a spectral type of O8(f)ep.[4] 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.[5]

## References

1. ↑ 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.
2. ↑ Henize, Karl G. (April 1967). "Observations of Southern Planetary Nebulae" (in en). The Astrophysical Journal Supplement Series 14: 125. doi:10.1086/190151. ISSN 0067-0049. Bibcode: 1967ApJS...14..125H.
3. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Sahai`
4. ↑ Mendez, R. H.; Niemela, V. S. (September 1979). "Observations of three central stars of planetary nebulae" (in en). The Astrophysical Journal 232: 496. doi:10.1086/157308. ISSN 0004-637X. Bibcode: 1979ApJ...232..496M.
5. ↑ Hutton, R. G.; Mendez, R. H. (January 1993). "The Central Stars of He 2-131 SND He 2-138: Photometric Variations" (in en). Planetary Nebulae. 267. L8. doi:10.1007/978-94-011-2088-3_229. ISBN 978-0-7923-2440-9. Bibcode: 1993A&A...267L...8H.

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Constellation of Apus

* Apus in Chinese astronomy
* List of stars in Apus

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ1
* κ2

|

Variable|

* R
* S
* Z
* MY
* NO

HR|

* 5955
* 6135

HD|

* 124639
* 130458
* 131551
* 131664
* 134606
* 137388 (Karaka)
* 137509
* 141846
* 152010
* 161988
* 164712
* 165259

| Star clusters|

* IC 4499
* NGC 6101

|

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