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Table 1
Derived cluster, nebula, stellar, and jet parameters.
| SH 2-266 | |
| E(B–V) | 1.2 ± 0.2 mag |
| AV | 3.7 ± 0.6 mag |
| d a | 5.2 ± 1.4 kpc |
| age | 3 Myr ≲ t ≲ 15 Myrb |
| mass | > 100 M⊙ |
| nebular age | >20 000 yr |
| vsystemic | 50 ± 20 km s-1 |
|
|
|
| MWC 137 | |
| E(B–V) | ~1.8 mag |
| A V | 5.6 mag |
| M V | −7.2 mag |
| log (L/L⊙)c | 6.0 |
| mass | 10–15 M⊙ |
|
|
|
| Jet | |
| projected length | 66′′ (1.7 pc) |
| deprojected lengthd | 93′′ (2.3 pc) |
| velocity | −433 km s-1 to + 478 km s-1 |
| deprojected velocityd | up to 650 km s-1 |
| age | >1800 yr |
| electron density | ~103 cm-3 |
| mass-loss rate | ~10-8 M⊙ yr-1 |
Notes.
(a)
In the future Gaia will provide a very accurate parallax for this object. Hipparcos found a parallax of about 1 kpc (van Leeuwen 2007).
(c)
Using a bolometric correction of BC = −3.03 (for a B0 star; Pecaut & Mamajek 2013).
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