V1331: And The Circumstellar Accretion Disk Around a T-Tauri Star OTA: OS700
Camera: QHY 600 Pro, binned 4x at capture
Observatory: Telescope Live, SPA-2
Exposures:
R: 25 x 120 sec
G: 26 x 120
B: 28 x 120
Total Exposure time used: 3.47 hours
Image Width: 21.5 arc-minutes
Processing Tools:
1. Commercial: PixInsight, Topaz (Studio2, Photo AI2), Aurora HDR, Luminar Neo, 3DLUT Creator, Photo Director
2. Pixinsight Addons: NoiseXTerminator, BlurXTerminator, StarXTerminator, Normalize Scale Gradient
3. My Scripts: NB_Assistant, AC_Restar, Subframe Weighting Tool (Excel w/ J. Hunt)
Target Description:
V1331 is a T-Tauri star—a very young star, less than 10M years old, surrounded by a “circumstellar accretion disk.” That disk, clearly visible in this image, hosts dust, gas, protoplanets, and asteroid (collision fragments). The star is very hot, and has yet to mature enough to reach the main-sequence part of the Russel-Hertzsprung diagram. More of the nebula (LDN 981) that gave birth to this star can be seen in the vicinity of this star and across the image. The star itself is embedded in its parent cloud and is not directly seen in this image. (A wide-angle image of this region appears here:
https://astrob.in/z0m4cd/0/).
The circumstellar cloud forms an incomplete torus around V 1331. Choudhary, et al. (
https://arxiv.org/pdf/1604.03667.pdf) suggested that the “missing part” of the circumstellar cloud was actually not missing, but hidden in a shadow by some intervening particles or cloud. The alternative explanation is that the missing part is covered by the dark nebula seen encroaching on that area from the lower right, or some other nebula.
Alex Woronow 
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