SIMBAD lists the class for CD -24 13962 = HD 165921 as B6 III, which would be too cool to ionise the nebula. However, a 2004 paper based on Hipparcos results gives the class as O7 V [1
], and a 1998 paper adds that this is a O7V+O9V multiple system [2
], so it appears that SIMBAD may be in error here.
Avedisova places Sh 2-29, Sh 2-31, and Sh 2-32 in the same star formation region (SFR 6.57-1.46
), although the associated CO velocities suggest that these objects may have quite different distances.
The infrared cluster [BDS2003] 2
is located in NGC 6559 (LBN 28)
, which is part of Sh 2-29.[3
You can view this region in its context next to the Lagoon nebula
in this amazing image here
and see a very detailed image of the NGC 6559 portion of Sh 2-29 here
1. ^ Schröder, S. E., Kaper, L., Lamers, H. J. G. L. M., et al. (2004). "On the
Hipparcos parallaxes of O stars", Astronomy and Astrophysics, Vol. 428,
2. ^ Vaz, L. P. R., Cunha, N. C. S., Andersen, J., et al. (1998). "Four-colour
photometry of eclipsing binaries. XXXVI. Light curves of the O7V+O9V system
V 3903 Sagittarii", Astronomy and Astrophysics Supplement Series, Vol.
128, 251-254. [1998A&AS..128..251V]
3. ^ Bica, E., Dutra, C. M., Soares, J., et al. (2003). "New infrared star
clusters in the Northern and Equatorial Milky Way with 2MASS", Astronomy
and Astrophysics, Vol. 404, 223-232. [2003A&A...404..223B]