Gum 42, IC 2944, Bran 362a
Coordinates: (294.8°, -1.5°)
The large bright nebula IC 2944 (RCW 62 / Gum 42) corresponds to the "body" of the Running Chicken
nebula complex, which is ionised by the Cru OB1
According to Avedisova, the nebula is ionised by the O6 III giant HD 101190
, the O6 V star HD 101436
and the O9 IV subgiant HD 101223
as well as the B0.5 Iab supergiant HD 101545
. (SIMBAD gives a much cooler B6Ib/II class for HD 101436.)
A 2013 study finds that the X-ray sources in this direction are concentrated around the O8 V star HD 101205
suggesting that this star may also be associated with the nebula.
Avedisova places RCW 60, RCW 61, RCW 62, Gum 39, Gum 40, Gum 41, Gum 42, and IC 2944 in star formation region SFR 293.64-1.41
with 51 components, including 7 masers and 18 infrared sources. Humphreys says that the hot stars in this direction form the Cru OB1
association at an average distance of 2510 parsecs.
Dutra and colleagues say that RCW 62 contains the infrared group [DBS2003] 69
, although curiously they give a distance of only 1700 parsecs.
You can see the spectacular MSX 8μm infrared view here
Some astronomers misleadingly call this the Lambda Centaurus nebula. Lambda Centaurus is the bright star in the upper right of the image, however, it is a foreground star at a distance of only 63 pc.
Lam Cen is a nearby star at a distance of 63 pc.[1
Cru OB1 is actually entirely in the constellation Centaurus.[2
X-rays sources in IC 2944 / 2948 are concentrated around HD 101205. [3
RCW 62 contains the infrared group [DBS2003] 69. [4
1. ^ Grosbol, P. J. (1978). "Space velocities and ages of nearby early-type
stars", Astronomy and Astrophysics Supplement Series, Vol. 32, 409-421.
2. ^ Tovmassian, H. M., Navarro, S. G., & Cardona, O. (1996). "OB Stellar
Associations in Crux. II. Analysis and Discussion", The Astronomical
Journal, Vol. 111, 306. [1996AJ....111..306T]
3. ^ Nazé, Y., Rauw, G., Sana, H., et al. (2013). "X-ray properties of the
young open clusters HM1 and IC 2944/2948", Astronomy and Astrophysics,
Vol. 555, A83. [2013A&A...555A..83N]
4. ^ Dutra, C. M., Bica, E., Soares, J., et al. (2003). "New infrared star
clusters in the southern Milky Way with 2MASS", Astronomy and Astrophysics,
Vol. 400, 533-539. [2003A&A...400..533D]