Astronomy:Sh 2-46
| Nebula | |
|---|---|
.jpg) Image of Sh 2-46 Nebula | |
| Observation data: epoch | |
| Right ascension | 18h 06m 6.00s[1] |
| Declination | −14° 08′ 60.0″[1] |
| Distance | 6,000 ly (2,000 pc) |
| Constellation | Serpens |
| Designations | Sh 2-46, RCW 158, Gum 80, LBN 58[1] |
Sh 2-46 (also known as RCW 158), is an H II region, a glowing cloud of ionized hydrogen gas—located in the southern constellation of Serpens. Situated approximately 6,000 light-years from Earth, the nebula is notable for its red emission caused by the ionization of hydrogen atoms, energized by the central runaway star HD 165319 (O9.7Ib).[2] It is an isolated nebula positioned above the galactic plane and contains polycyclic aromatic hydrocarbons (PAHs).[3][4][5] It is located about 3° west of the Eagle Nebula (Messier 16) and is part of broader star-forming activity in the region.[6]
Central star
The primary ionizing source for Sh 2-46 is the massive O-type supergiant star HD 165319, classified as O9.7Ib. This luminous blue star is a runaway star, believed to have originated in the nearby Eagle Nebula (NGC 6611) but was ejected due to gravitational interactions about 1.8 million years ago. As it travels through Sh 2-46 at high speed, it creates a dynamic environment, including the observed bow shock.[2][3][7][8]
References
- ↑ 1.0 1.1 1.2 "Simbad - Object view". https://simbad.cds.unistra.fr/mobile/object.html?object_name=Sh%202-46.
- ↑ 2.0 2.1 "HD 165319". https://simbad.cds.unistra.fr/mobile/object.html?object_name=HD%20165319.
- ↑ 3.0 3.1 "Sh 2-46". http://galaxymap.org/cat/view/sharpless/46.
- ↑ Giard, M.; Pajot, F.; Lamarre, J. M.; Serra, G.; Caux, E. (May 1989). "The galactic emission in the 3.3 mu-m aromatic feature. I. Observations." (in en). Astronomy and Astrophysics 215: 92–100. ISSN 0004-6361. Bibcode: 1989A&A...215...92G. https://ui.adsabs.harvard.edu/abs/1989A&A...215...92G/abstract.
- ↑ information@eso.org. "There is an impostor in this nebula" (in en). https://www.eso.org/public/images/potw2518a/.
- ↑ Ritschel, Kevin (2023-10-10). "Explore these three great nebulae" (in en-US). https://www.astronomy.com/observing/explore-great-summer-nebulae/.
- ↑ de Wit, W. J.; Testi, L.; Palla, F.; Vanzi, L.; Zinnecker, H. (October 2004). "The origin of massive O-type field stars. I. A search for clusters" (in en). Astronomy and Astrophysics 425 (3): 937–948. doi:10.1051/0004-6361:20040454. ISSN 0004-6361. Bibcode: 2004A&A...425..937D. https://ui.adsabs.harvard.edu/abs/2004A&A...425..937D/abstract.
- ↑ Gvaramadze, V. V.; Bomans, D. J. (November 2008). "Search for OB stars running away from young star clusters. I. NGC 6611" (in en). Astronomy and Astrophysics 490 (3): 1071–1077. doi:10.1051/0004-6361:200810411. ISSN 0004-6361. Bibcode: 2008A&A...490.1071G. https://ui.adsabs.harvard.edu/abs/2008A&A...490.1071G/abstract.
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