The filaments of the extended nebula RCW 59 may be associated with the Car OB2
association. They do not appear to be visible in this DSS-2 image however. (The RCW catalog says that this nebula is a huge 3 degree loop.)
A 2008 study concludes that RCW 59 is probably a supernova remnant rather than an HII region.
On the earlier assumption that this was an HII region, Avedisova identified two potential B-class ionising stars: the B0 III giant HD 99890
and the B 2Iab-Ib supergiant HD 99939
.You can see this faint loop in this SuperCOSMOS hydrogen-alpha image.
The filaments of the extended HII region RCW 59 appear to be associated with the Car OB2 association.[1
This is probably a supernova remnant. [2
1. ^ Georgelin, Y. M., Russeil, D., Amram, P., et al. (2000). "Deep Hα survey
of the Milky Way. V. The l=289o to 295o area", Astronomy and
Astrophysics, Vol. 357, 308-324. [2000A&A...357..308G]
2. ^ Stupar, M., Parker, Q. A., & Filipović, M. D. (2008). "Newly confirmed and
candidate Galactic SNRs uncovered from the AAO/UKST Hα survey", Monthly
Notices of the Royal Astronomical Society, Vol. 390, 1037-1054.