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Table 8

Detected nebular shells, their semi-minor and semi-major dimensions in arcsec and in pc.

Star Shell radii Shell radii λ Figure Shell radii
arcsec × arcsec pc × pc μm pc × pc
Weis (2011)

Pistol Star 25.5 × 24 0.99 × 0.93 8 A.1 0.8 × 1.2
WR102ka 58 × 55 2.25 × 2.13 22 A.2
LBV1806-20* _ _ 3.4-22 A.3
HD 168625 int1 19 × 14 0.20 × 0.15 22 1, 2 0.17 × 0.13
HD 168625 imd1 46 × 41 0.49 × 0.44 22 2
HD 168625 ext1 80: × 70: 0.85 × 0.75 22 2
HD 168625 ring1 33 × 40 0.35 × 0.43 8 2
HD 168607 9.5 0.10 22 A.4
MWC930 59 × 54 1.00 × 0.92 22 A.5
MWC314 26 0.38 22 A.6
HD 152234 16–20 0.150.19 3.422 A.7
HD 164794 11 0.060.10 5.6 A.8

Notes. In the case of a round shell, only one extent is provided. The extent size is defined using the convention of 10% of the peak surface brightness (Tylenda et al. 2003). The distance of the stars to the Earth is available in Table 1.

(*)

There is no indication for the star LBV1806-20 because it is deeply embedded in a complex with other WR stars and it is not possible to determine to which star the nebula belongs. The last column provides the measurements performed by Weis (2011) in pc.

(1)

The outer radius measured along the axes ESE-WNW and NE–SW of the internal (int), the intermediate (imd), and the external (ext) shells are given for HD 168625. As a reference, the dimensions of the NE ring are also indicated.

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