This isolated nebula is located well above the galactic plane.
Avedisova concludes that it is ionised by the potential runaway O9.5 Iab supergiant HD 165319
, which may have been ejected from NGC 6611
, the central star cluster of M 16, the Eagle nebula, about 1.8 million years ago.
You can see a good image of this nebula in the SuperCOSMOS data
Polycyclic aromatic hydrocarbons (PAHs) have been detected in this HII region.[1
The O-star HD 165319 lies within or behind this nebula.[2
This star is given a B0 Ia class in a 1970 paper by Humphreys
, but is, curiously, not included in her final catalog of OB stars and supergiants.
HD 165319 may have been ejected from NGC 6611 about 1.8 million years ago. [3
1. ^ Giard, M., Serra, G., Caux, E., et al. (1989). "The Galactic emission in
the 3.3-micron aromatic feature. I - Observations", Astronomy and
Astrophysics, Vol. 215, 92-100. [1989A&A...215...92G]
2. ^ de Wit, W. J., Testi, L., Palla, F., et al. (2004). "The origin of massive
O-type field stars. I. A search for clusters", Astronomy and Astrophysics,
Vol. 425, 937-948. [2004A&A...425..937D]
3. ^ Gvaramadze, V. V. & Bomans, D. J. (2008). "Search for OB stars running
away from young star clusters. I. NGC 6611", Astronomy and Astrophysics,
Vol. 490, 1071-1077. [2008A&A...490.1071G]